KENNEDY SPACE CENTER, FLA. -- STS-120 Mission Specialist Doug Wheelock gets ready in the driver's seat for driving practice in the M-113 armored personnel carrier. The M-113 is part of emergency exit procedures from Launch Pad 39A. Behind him, at right, is Pilot George Zamka. The training is part of terminal countdown demonstration test, or TCDT, activities the crew is undertaking at NASA's Kennedy Space Center. The TCDT also includes equipment familiarization and a simulated launch countdown. Mission STS-120, which will carry the Italian-built U.S. Node 2 to the International Space Station, is targeted for launch on Oct. 23. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-120 Commander Pamela Melroy is ready for her turn at driving practice in the M-113 armored personnel carrier. The M-113 is part of emergency exit procedures from Launch Pad 39A. The training is part of terminal countdown demonstration test, or TCDT, activities the crew is undertaking at NASA's Kennedy Space Center. The TCDT also includes equipment familiarization and a simulated launch countdown. Mission STS-120, which will carry the Italian-built U.S. Node 2 to the International Space Station, is targeted for launch on Oct. 23. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-120 Commander Pamela Melroy poses for another photo after driving practice in the M-113 armored personnel carrier. The M-113 is part of emergency exit procedures from Launch Pad 39A. The training is part of terminal countdown demonstration test, or TCDT, activities the crew is undertaking at NASA's Kennedy Space Center. The TCDT also includes equipment familiarization and a simulated launch countdown. Mission STS-120, which will carry the Italian-built U.S. Node 2 to the International Space Station, is targeted for launch on Oct. 23. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-120 Mission Specialist Paolo Nespoli, who represents the European Space Agency, gets ready in the driver's seat for driving practice in the M-113 armored personnel carrier. The M-113 is part of emergency exit procedures from Launch Pad 39A. The training is part of terminal countdown demonstration test, or TCDT, activities the crew is undertaking at NASA's Kennedy Space Center. The TCDT also includes equipment familiarization and a simulated launch countdown. Mission STS-120, which will carry the Italian-built U.S. Node 2 to the International Space Station, is targeted for launch on Oct. 23. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – STS-127 Mission Specialist Dave Wolf takes the wheel of the M-113 armored personnel carrier. Driving the M-113 is part of the training on emergency egress procedures. The crew members of space shuttle Endeavour's STS-127 mission are taking turns driving the M-113. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes the emergency egress training and equipment familiarization. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex. Endeavour's launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-120 Mission Specialist Daniel Tani is ready for his turn at driving the M-113 armored personnel carrier. The M-113 is part of emergency exit procedures from Launch Pad 39A. Behind him, at right, is Mission Specialist Paolo Nespoli, who represents the European Space Agency. The training is part of terminal countdown demonstration test, or TCDT, activities the crew is undertaking at NASA's Kennedy Space Center. The TCDT also includes equipment familiarization and a simulated launch countdown. Mission STS-120, which will carry the Italian-built U.S. Node 2 to the International Space Station, is targeted for launch on Oct. 23. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-120 crew members signal their pleasure in participating in M-113 driving practice, part of emergency exit procedures from Launch Pad 39A. Seen here on the M-113 are Mission Specialists Scott Parazynski, Stephanie Wilson, Daniel Tani, Paolo Nespoli and Doug Wheelock. Nespoli represents the European Space Agency. The training is part of terminal countdown demonstration test, or TCDT, activities the crew is undertaking at NASA's Kennedy Space Center. The TCDT also includes equipment familiarization and a simulated launch countdown. Mission STS-120, which will carry the Italian-built U.S. Node 2 to the International Space Station, is targeted for launch on Oct. 23. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-120 Pilot George Zamka practices driving the M-113 armored personnel carrier, part of emergency exit procedures from Launch Pad 39A. Alongside is the trainer. In the rear of the M-113 are Mission Specialists Daniel Tani, Commander Pamela Melroy and Mission Specialists Stephanie Wilson, Paolo Nespoli and Doug Wheelock. Nespoli represents the European Space Agency. The training is part of terminal countdown demonstration test, or TCDT, activities the crew is undertaking at NASA's Kennedy Space Center. The TCDT also includes equipment familiarization and a simulated launch countdown. Mission STS-120, which will carry the Italian-built U.S. Node 2 to the International Space Station, is targeted for launch on Oct. 23. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- After driving practice on the M-113 armored personnel carrier, the STS-120 crew pauses for a group photo. From left are Mission Specialists Scott Parazynski, Daniel Tani and Doug Wheelock, Commander Pamela Melroy, Mission Specialist Stephanie Wilson, Pilot George Zamka and Mission Specialist Paolo Nespoli, who represents the European Space Agency. The M-113 is part of emergency exit procedures from Launch Pad 39A. The training is part of terminal countdown demonstration test, or TCDT, activities the crew is undertaking at NASA's Kennedy Space Center. The TCDT also includes equipment familiarization and a simulated launch countdown. Mission STS-120, which will carry the Italian-built U.S. Node 2 to the International Space Station, is targeted for launch on Oct. 23. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-120 Mission Specialist Stephanie Wilson is ready for her turn at driving the M-113 armored personnel carrier. The M-113 is part of emergency exit procedures from Launch Pad 39A. Behind her are Mission Specialists Doug Wheelock, at left) and Paolo Nespoli, who represents the European Space Agency. The training is part of terminal countdown demonstration test, or TCDT, activities the crew is undertaking at NASA's Kennedy Space Center. The TCDT also includes equipment familiarization and a simulated launch countdown. Mission STS-120, which will carry the Italian-built U.S. Node 2 to the International Space Station, is targeted for launch on Oct. 23. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-120 Mission Specialist Scott Parazynski is ready for his turn at driving the M-113 armored personnel carrier. The M-113 is part of emergency exit procedures from Launch Pad 39A. Behind Parazynski is Mission Specialist Paolo Nespoli, who represents the European Space Agency. The training is part of terminal countdown demonstration test, or TCDT, activities the crew is undertaking at NASA's Kennedy Space Center. The TCDT also includes equipment familiarization and a simulated launch countdown. Mission STS-120, which will carry the Italian-built U.S. Node 2 to the International Space Station, is targeted for launch on Oct. 23. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- Driven by Mission Specialist Daniel Tani, the M-113 armored personnel carrier moves through the underbrush near Launch Pad 39A. The M-113 is part of emergency exit procedures from Launch Pad 39A. Also in front is the trainer. In the rear are Mission Specialists Doug Wheelock, Scott Parazynski and Paolo Nespoli, who represents the European Space Agency. The training is part of terminal countdown demonstration test, or TCDT, activities the crew is undertaking at NASA's Kennedy Space Center. The TCDT also includes equipment familiarization and a simulated launch countdown. Mission STS-120, which will carry the Italian-built U.S. Node 2 to the International Space Station, is targeted for launch on Oct. 23. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-120 Pilot George Zamka gets ready in the driver's seat for driving practice in the M-113 armored personnel carrier. The M-113 is part of emergency exit procedures from Launch Pad 39A. Behind Zamka, half hidden, is Mission Specialist Paolo Nespoli, who represents the European Space Agency. The training is part of terminal countdown demonstration test, or TCDT, activities the crew is undertaking at NASA's Kennedy Space Center. The TCDT also includes equipment familiarization and a simulated launch countdown. Mission STS-120, which will carry the Italian-built U.S. Node 2 to the International Space Station, is targeted for launch on Oct. 23. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-120 Pamela Melroy (front) is ready for training on the M-113 armored personnel carrier, part of emergency egress training. The training is part of terminal countdown demonstration test, or TCDT, activities the crew is undertaking at NASA's Kennedy Space Center. The TCDT also includes equipment familiarization and a simulated launch countdown. Mission STS-120, which will carry the Italian-built U.S. Node 2 to the International Space Station, is targeted for launch on Oct. 23. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – STS-127 Pilot Doug Hurley smiles after practicing driving the M-113 armored personnel carrier. The crew members of space shuttle Endeavour's STS-127 mission will each practice driving the M-113 in turn as part of their training on emergency egress procedures. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes the emergency egress training and equipment familiarization. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex. Endeavour's launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – STS-127 Commander Mark Polansky smiles after practicing driving the M-113 armored personnel carrier. The crew members of space shuttle Endeavour's STS-127 mission will each practice driving the M-113 in turn as part of their training on emergency egress procedures. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes the emergency egress training and equipment familiarization. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex. Endeavour's launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – STS-127 Mission Specialist Tom Marshburn takes his turn driving the M-113 armored personnel carrier, which is part of the training on emergency egress procedures. The crew members of space shuttle Endeavour's STS-127 mission are taking turns driving the M-113. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes the emergency egress training and equipment familiarization. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex. Endeavour's launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – STS-127 Mission Specialist Tim Kopra is happy to have successfully driven the M-113 armored personnel carrier, which is part of the training on emergency egress procedures. The crew members of space shuttle Endeavour's STS-127 mission are taking turns driving the M-113. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes the emergency egress training and equipment familiarization. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex. Endeavour's launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – STS-127 Commander Mark Polansky takes his turn driving the M-113 armored personnel carrier, which is part of the training on emergency egress procedures. The crew members of space shuttle Endeavour's STS-127 mission are taking turns driving the M-113. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes the emergency egress training and equipment familiarization. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex. Endeavour's launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – STS-127 Mission Specialist Christopher Cassidy is ready to take the wheel to practice driving the M-113 armored personnel carrier, which is part of the training on emergency egress procedures. The crew members of space shuttle Endeavour's STS-127 mission are taking turns driving the M-113. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes the emergency egress training and equipment familiarization. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex. Endeavour's launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – STS-127 Mission Specialist Julie Payette takes her turn practice driving the M-113 armored personnel carrier, which is part of the training on emergency egress procedures. Payette represents the Canadian Space Agency. Behind her is Pilot Doug Hurley. The crew members of space shuttle Endeavour's STS-127 mission are taking turns driving the M-113. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes the emergency egress training and equipment familiarization. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex. Endeavour's launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – STS-127 Mission Specialist Tim Kopra practices driving the M-113 armored personnel carrier, which is part of the training on emergency egress procedures. Other crew members are seated behind him and will take their turns at driving the M-113. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes the emergency egress training and equipment familiarization. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex. Endeavour's launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – STS-127 Mission Specialist Christopher Cassidy practices driving the M-113 armored personnel carrier, which is part of the training on emergency egress procedures. Other crew members seated behind him are Mission Specialist Julie Payette, Dave Wolf, Tom Marshburn and Pilot Doug Hurley, who will take their turns at driving the M-113. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes the emergency egress training and equipment familiarization. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex. Endeavour's launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – STS-127 Mission Specialist Dave Wolf poses for a photograph after driving the M-113 armored personnel carrier, which is part of the training on emergency egress procedures. The crew members of space shuttle Endeavour's STS-127 mission are taking turns driving the M-113. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes the emergency egress training and equipment familiarization. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex. Endeavour's launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – STS-127 Mission Specialist Julie Payette smiles after her success in driving the M-113 armored personnel carrier, which is part of the training on emergency egress procedures. Payette represents the Canadian Space Agency. The crew members of space shuttle Endeavour's STS-127 mission are taking turns driving the M-113. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes the emergency egress training and equipment familiarization. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex. Endeavour's launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – STS-127 Mission Specialist Tom Marshburn smiles after successfully driving the M-113 armored personnel carrier, which is part of the training on emergency egress procedures. The crew members of space shuttle Endeavour's STS-127 mission are taking turns driving the M-113. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes the emergency egress training and equipment familiarization. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex. Endeavour's launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-120 Pamela Melroy is ready for training on the M-113 armored personnel carrier, part of emergency egress training. Behind her Mission Specialist Paolo Nespoli looks on. Nespoli is with the European Space Agency. The training is part of terminal countdown demonstration test, or TCDT, activities the crew is undertaking at NASA's Kennedy Space Center. The TCDT also includes equipment familiarization and a simulated launch countdown. Mission STS-120, which will carry the Italian-built U.S. Node 2 to the International Space Station, is targeted for launch on Oct. 23. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-120 Commander Pamela Melroy drives the M-113 armored personnel carrier near Launch Pad 39A as part of emergency exit procedures. Beside her in front is the trainer. In the rear are Mission Specialists Daniel Tani and Paolo Nespoli, who represents the European Space Agency. The training is part of terminal countdown demonstration test, or TCDT, activities the crew is undertaking at NASA's Kennedy Space Center. The TCDT also includes equipment familiarization and a simulated launch countdown. Mission STS-120, which will carry the Italian-built U.S. Node 2 to the International Space Station, is targeted for launch on Oct. 23. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – The STS-127 crew members sit in the M-113 armored personnel carrier for instructions on driving the M-113 as part of their training on emergency egress procedures. On the left are Commander Mark Polansky and Mission Specialists Tom Marshburn, Julie Payette and Dave Wolf (behind Payette). On the right are Mission Specialist Christopher Cassidy, Pilot Doug Hurley and Mission Specialist Tim Kopra. The crew members of space shuttle Endeavour's STS-127 mission will each practice driving the M-113. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes the emergency egress training and equipment familiarization. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex. Endeavour's launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – STS-127 Pilot Doug Hurley drives the M-113 armored personnel carrier, which is part of the training on emergency egress procedures. The crew members of space shuttle Endeavour's STS-127 mission are taking turns driving the M-113, which will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes the emergency egress training and equipment familiarization. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex. Endeavour's launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-120 crew members listen to instructions about the use of the M-113 armored personnel carrier for emergency exit procedures from Launch Pad 39A. From the front, on the left, are Mission Specialists Doug Wheelock, Paolo Nespoli and Stephanie Wilson; at right are Pilot George Zamka, Mission Specialists Scott Parazynski and Daniel Tani, and Commander Pamela Melroy. Nespoli represents the European Space Agency. The training is part of terminal countdown demonstration test, or TCDT, activities the crew is undertaking at NASA's Kennedy Space Center. The TCDT also includes equipment familiarization and a simulated launch countdown. Mission STS-120, which will carry the Italian-built U.S. Node 2 to the International Space Station, is targeted for launch on Oct. 23. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- An M-113 armored personnel carrier pushes through the underbrush during driving practice by the STS-120 crew. In the driver's seat, at right, is Mission Specialist Doug Wheelock. In the center is the trainer. Other crew members in the rear are (left to right) Mission Specialists Daniel Tani, Scott Parazynski and Paolo Nespoli and Pilot George Zamka. Nespoli represents the European Space Agency. The training is part of terminal countdown demonstration test, or TCDT, activities the crew is undertaking at NASA's Kennedy Space Center. The TCDT also includes equipment familiarization and a simulated launch countdown. Mission STS-120, which will carry the Italian-built U.S. Node 2 to the International Space Station, is targeted for launch on Oct. 23. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- Outside the M-113 armored personnel carrier, STS-120 crew members listen to instructions on its use for emergency exit procedures from Launch Pad 39A. From left are Mission Specialists Daniel Tani and Doug Wheelock, Pilot George Zamka, Mission Specialist Scott Parazynski, Commander Pamela Melroy, and Mission Specialists Paolo Nespoli and Stephanie Wilson. Nespoli represents the European Space Agency. The training is part of terminal countdown demonstration test, or TCDT, activities the crew is undertaking at NASA's Kennedy Space Center. The TCDT also includes equipment familiarization and a simulated launch countdown. Mission STS-120, which will carry the Italian-built U.S. Node 2 to the International Space Station, is targeted for launch on Oct. 23. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-120 Mission Specialist Paolo Nespoli, who represents the European Space Agency, practices driving the M-113 armored personnel carrier, which is part of emergency exit procedures from Launch Pad 39A. Also in front is the trainer. Passenger crew members in the rear are (from left) Mission Specialists Daniel Tani, Commander Pamela Melroy, Mission Specialist Scott Parazynski and Pilot George Zamka. The training is part of terminal countdown demonstration test, or TCDT, activities the crew is undertaking at NASA's Kennedy Space Center. The TCDT also includes equipment familiarization and a simulated launch countdown. Mission STS-120, which will carry the Italian-built U.S. Node 2 to the International Space Station, is targeted for launch on Oct. 23. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - During Terminal Countdown Demonstration Test (TCDT) activities, the STS-121 crew gets instructions about emergency egress from the pad from Capt. George Hoggard (left), who is astronaut rescue team leader. Crew members are (from left) Mission Specialist Piers Sellers, Pilot Mark Kelly, Mission Specialists Stephanie Wilson and Lisa Nowak, Commander Steven Lindsey, and Mission Specialists Thomas Reiter and Michael Fossum. Part of the training will be driving an M-113, which is an armored personnel carrier. Mission STS-121 is designated for launch on July 1. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, STS-129 Pilot Barry E. Wilmore, at right, takes his crew and instructor for a ride in an M113 armored personnel carrier during driving practice. Left of Wilmore is the instructor, Battalion Chief George Hoggard. The M113 is kept at the foot of the launch pad in case an emergency egress from the vicinity of the pad is needed. The crew members of space shuttle Atlantis' STS-129 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. Launch of Atlantis on its STS-129 mission to the International Space Station is targeted for Nov. 16. For information on the STS-129 mission objectives and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts129/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, STS-129 Commander Charles O. Hobaugh, at right, takes his crew and instructor for a ride in an M113 armored personnel carrier during driving practice. Left of Hobaugh is the instructor, Battalion Chief George Hoggard. The M113 is kept at the foot of the launch pad in case an emergency egress from the vicinity of the pad is needed. The crew members of space shuttle Atlantis' STS-129 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. Launch of Atlantis on its STS-129 mission to the International Space Station is targeted for Nov. 16. For information on the STS-129 mission objectives and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts129/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, STS-129 Mission Specialist Mike Foreman, at right, takes his crew and instructor for a ride in an M113 armored personnel carrier during driving practice. Left of Wilmore is the instructor, Battalion Chief George Hoggard. The M113 is kept at the foot of the launch pad in case an emergency egress from the vicinity of the pad is needed. The crew members of space shuttle Atlantis' STS-129 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. Launch of Atlantis on its STS-129 mission to the International Space Station is targeted for Nov. 16. For information on the STS-129 mission objectives and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts129/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, STS-129 Mission Specialist Robert L. Satcher Jr., at right, takes his crew and instructor for a ride in an M113 armored personnel carrier during driving practice. Left of Satcher is the instructor, Battalion Chief George Hoggard. The M113 is kept at the foot of the launch pad in case an emergency egress from the vicinity of the pad is needed. The crew members of space shuttle Atlantis' STS-129 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. Launch of Atlantis on its STS-129 mission to the International Space Station is targeted for Nov. 16. For information on the STS-129 mission objectives and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts129/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, STS-129 Pilot Barry E. Wilmore prepares to drive an M113 armored personnel carrier. The M113 is kept at the foot of the launch pad in case an emergency egress from the vicinity of the pad is needed. The crew members of space shuttle Atlantis' STS-129 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. Launch of Atlantis on its STS-129 mission to the International Space Station is targeted for Nov. 16. For information on the STS-129 mission objectives and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts129/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, STS-129 Pilot Barry E. Wilmore prepares to practice driving an M113 armored personnel carrier. The M113 is kept at the foot of the launch pad in case an emergency egress from the vicinity of the pad is needed. The crew members of space shuttle Atlantis' STS-129 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. Launch of Atlantis on its STS-129 mission to the International Space Station is targeted for Nov. 16. For information on the STS-129 mission objectives and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts129/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, STS-129 Commander Charles O. Hobaugh prepares to drive an M113 armored personnel carrier. The M113 is kept at the foot of the launch pad in case an emergency egress from the vicinity of the pad is needed. The crew members of space shuttle Atlantis' STS-129 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. Launch of Atlantis on its STS-129 mission to the International Space Station is targeted for Nov. 16. For information on the STS-129 mission objectives and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts129/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, STS-129 Mission Specialist Robert L. Satcher Jr. prepares to practice driving an M113 armored personnel carrier. The M113 is kept at the foot of the launch pad in case an emergency egress from the vicinity of the pad is needed. The crew members of space shuttle Atlantis' STS-129 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. Launch of Atlantis on its STS-129 mission to the International Space Station is targeted for Nov. 16. For information on the STS-129 mission objectives and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts129/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, STS-129 Mission Specialist Mike Foreman prepares to drive an M113 armored personnel carrier. The M113 is kept at the foot of the launch pad in case an emergency egress from the vicinity of the pad is needed. The crew members of space shuttle Atlantis' STS-129 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. Launch of Atlantis on its STS-129 mission to the International Space Station is targeted for Nov. 16. For information on the STS-129 mission objectives and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts129/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, STS-129 Mission Specialist Leland Melvin prepares to practice driving an M113 armored personnel carrier. The M113 is kept at the foot of the launch pad in case an emergency egress from the vicinity of the pad is needed. The crew members of space shuttle Atlantis' STS-129 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. Launch of Atlantis on its STS-129 mission to the International Space Station is targeted for Nov. 16. For information on the STS-129 mission objectives and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts129/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, STS-129 Mission Specialist Leland Melvin prepares to drive an M113 armored personnel carrier. The M113 is kept at the foot of the launch pad in case an emergency egress from the vicinity of the pad is needed. The crew members of space shuttle Atlantis' STS-129 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. Launch of Atlantis on its STS-129 mission to the International Space Station is targeted for Nov. 16. For information on the STS-129 mission objectives and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts129/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, STS-129 Mission Specialist Mike Foreman prepares to practice driving an M113 armored personnel carrier. The M113 is kept at the foot of the launch pad in case an emergency egress from the vicinity of the pad is needed. The crew members of space shuttle Atlantis' STS-129 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. Launch of Atlantis on its STS-129 mission to the International Space Station is targeted for Nov. 16. For information on the STS-129 mission objectives and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts129/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, STS-129 Mission Specialist Leland Melvin, at right, takes his crew and instructor for a ride in an M113 armored personnel carrier during driving practice. Left of Satcher is the instructor, Battalion Chief George Hoggard, and Commander Charles O. Hobaugh. The M113 is kept at the foot of the launch pad in case an emergency egress from the vicinity of the pad is needed. The crew members of space shuttle Atlantis' STS-129 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. Launch of Atlantis on its STS-129 mission to the International Space Station is targeted for Nov. 16. For information on the STS-129 mission objectives and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts129/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, STS-129 Mission Specialist Robert L. Satcher Jr. prepares to drive an M113 armored personnel carrier. The M113 is kept at the foot of the launch pad in case an emergency egress from the vicinity of the pad is needed. The crew members of space shuttle Atlantis' STS-129 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. Launch of Atlantis on its STS-129 mission to the International Space Station is targeted for Nov. 16. For information on the STS-129 mission objectives and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts129/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, the STS-129 crew poses for a group portrait with the M113 armored personnel carrier which they each practiced driving. From left, on the ground, are Commander Charles O. Hobaugh and Mission Specialist Robert L. Satcher Jr. From left, on the M113, are Mission Specialists Mike Foreman and Randy Bresnik, Pilot Barry E. Wilmore and Mission Specialist Leland Melvin. The M113 is kept at the foot of the launch pad in case an emergency egress from the vicinity of the pad is needed. The crew members of space shuttle Atlantis' STS-129 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. Launch of Atlantis on its STS-129 mission to the International Space Station is targeted for Nov. 16. For information on the STS-129 mission objectives and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts129/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, Battalion Chief George Hoggard, back to camera, instructs the STS-129 crew on the operation of an M113 armored personnel carrier. From left are Commander Charles O. Hobaugh; Mission Specialist Mike Foreman; Pilot Barry E. Wilmore; and Mission Specialists Randy Bresnik, Leland Melvin and Robert L. Satcher Jr. The M113 is kept at the foot of the launch pad in case an emergency egress from the vicinity of the pad is needed. The crew members of space shuttle Atlantis' STS-129 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. Launch of Atlantis on its STS-129 mission to the International Space Station is targeted for Nov. 16. For information on the STS-129 mission objectives and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts129/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, members of the STS-129 crew receive instruction on the operation of an M113 inside the armored personnel carrier. From left are Mission Specialist Robert L. Satcher Jr., Pilot Barry E. Wilmore and Commander Charles O. Hobaugh. The M113 is kept at the foot of the launch pad in case an emergency egress from the vicinity of the pad is needed. The crew members of space shuttle Atlantis' STS-129 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. Launch of Atlantis on its STS-129 mission to the International Space Station is targeted for Nov. 16. For information on the STS-129 mission objectives and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts129/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, STS-129 Mission Specialist Randy Bresnik prepares to practice driving an M113 armored personnel carrier. The M113 is kept at the foot of the launch pad in case an emergency egress from the vicinity of the pad is needed. The crew members of space shuttle Atlantis' STS-129 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. Launch of Atlantis on its STS-129 mission to the International Space Station is targeted for Nov. 16. For information on the STS-129 mission objectives and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts129/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, STS-129 Mission Specialist Randy Bresnik prepares to drive an M113 armored personnel carrier. The M113 is kept at the foot of the launch pad in case an emergency egress from the vicinity of the pad is needed. The crew members of space shuttle Atlantis' STS-129 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. Launch of Atlantis on its STS-129 mission to the International Space Station is targeted for Nov. 16. For information on the STS-129 mission objectives and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts129/index.html. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - STS-121 Pilot Mark Kelly takes his turn in an M-113, which is an armored personnel carrier. Behind him can be seen Mission Specialists Lisa Nowak and Thomas Reiter from Germany, who represents the European Space Agency. The STS-121 crew is taking turns driving the M-113 as part of Terminal Countdown Demonstration Test activities, which include emergency egress training from the pad and a simulated countdown. Mission STS-121 is designated for launch on July 1. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - Following training in the M-113 armored personnel carrier, the STS-121 crew pose for a photo with Capt. George Hoggard, who is astronaut rescue team leader. From left are Pilot Mark Kelly, Mission Specialist Lisa Nowak, Hoggard, Commander Steven Lindsey, and Mission Specialists Michael Fossum, Stephanie Wilson, Thomas Reiter and Piers Sellers. Reiter is from Germany and represents the European Space Agency. The STS-121 crew is taking turns driving the M-113 as part of Terminal Countdown Demonstration Test activities, which include emergency egress training from the pad and a simulated countdown. Mission STS-121 is designated for launch on July 1. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - STS-121 Commander Steven Lindsey takes his turn driving an M-113, which is an armored personnel carrier. The STS-121 crew is taking turns driving the M-113 as part of Terminal Countdown Demonstration Test activities, which include emergency egress training from the pad and a simulated countdown. Mission STS-121 is designated for launch on July 1. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - STS-121 Mission Specialist Lisa Nowak takes her turn in an M-113, which is an armored personnel carrier. Behind her, at right, is Mission Specialist Thomas Reiter from Germany, and represents the European Space Agency. The STS-121 crew is taking turns driving the M-113 as part of Terminal Countdown Demonstration Test activities, which include emergency egress training from the pad and a simulated countdown. Mission STS-121 is designated for launch on July 1. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - STS-121 Mission Specialist Thomas Reiter is taking his turn driving an M-113, which is an armored personnel carrier. Reiter is from Germany and represents the European Space Agency. The STS-121 crew is taking turns driving the M-113 as part of Terminal Countdown Demonstration Test activities, which include emergency egress training from the pad and a simulated countdown. Mission STS-121 is designated for launch on July 1. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - STS-121 Mission Specialist Michael Fossum takes his turn in an M-113, which is an armored personnel carrier. The STS-121 crew is taking turns driving the M-113 as part of Terminal Countdown Demonstration Test activities, which include emergency egress training from the pad and a simulated countdown. Mission STS-121 is designated for launch on July 1. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - STS-121 Mission Specialist Piers Sellers takes his turn in an M-113, which is an armored personnel carrier. Behind him are Mission Specialists Lisa Nowak and Thomas Reiter from Germany, who represents the European Space Agency. The STS-121 crew is taking turns driving the M-113 as part of Terminal Countdown Demonstration Test activities, which include emergency egress training from the pad and a simulated countdown. Mission STS-121 is designated for launch on July 1. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - STS-121 Mission Specialist Stephanie Wilson takes her turn in an M-113, which is an armored personnel carrier. Behind her, at right, is Mission Specialist Thomas Reiter from Germany, and represents the European Space Agency. The STS-121 crew is taking turns driving the M-113 as part of Terminal Countdown Demonstration Test activities, which include emergency egress training from the pad and a simulated countdown. Mission STS-121 is designated for launch on July 1. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - Under the watchful eye of Capt. George Hoggard (left front), who is astronaut rescue team leader, STS-121 Commander Steven Lindsey takes his turn driving an M-113, which is an armored personnel carrier. Behind Lindsey and Hoggard are Mission Specialists Piers Sellers (waving) and Michael Fossum. The STS-121 crew is taking turns driving the M-113 as part of Terminal Countdown Demonstration Test activities, which include emergency egress training from the pad and a simulated countdown. Mission STS-121 is designated for launch on July 1. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- At Launch Complex 39, STS-117 Mission Specialist Steven Swanson is helmeted and ready to practice driving an M-113 armored personnel carrier. The astronauts on the STS-117 crew are participating in M-113 armored personnel carrier training during Terminal Countdown Demonstration Test (TCDT) activities, a dress rehearsal for their launch, targeted for March 15. The M-113 could be used to move the crew away from the launch pad quickly in the event of an emergency. The TCDT also includes pad emergency egress training and a simulated launch countdown. The mission payload aboard Space Shuttle Atlantis is the S3/S4 integrated truss structure, along with a third set of solar arrays and batteries. The crew of six astronauts will install the truss to continue assembly of the station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- At Launch Complex 39, STS-117 Pilot Lee Archambault is helmeted and ready to practice driving an M-113 armored personnel carrier. The astronauts on the STS-117 crew are participating in M-113 armored personnel carrier training during Terminal Countdown Demonstration Test (TCDT) activities, a dress rehearsal for their launch, targeted for March 15. The M-113 could be used to move the crew away from the launch pad quickly in the event of an emergency. The TCDT also includes pad emergency egress training and a simulated launch countdown. The mission payload aboard Space Shuttle Atlantis is the S3/S4 integrated truss structure, along with a third set of solar arrays and batteries. The crew of six astronauts will install the truss to continue assembly of the station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- At Launch Complex 39, members of the STS-117 crew are instructed in the operation of an M-113 armored personnel carrier by astronaut rescue team leader Capt. George Hoggard (left). The astronauts on the STS-117 crew are participating in M-113 armored personnel carrier training during Terminal Countdown Demonstration Test (TCDT) activities, a dress rehearsal for their launch, targeted for March 15. The M-113 could be used to move the crew away from the launch pad quickly in the event of an emergency. The TCDT also includes pad emergency egress training and a simulated launch countdown. The mission payload aboard Space Shuttle Atlantis is the S3/S4 integrated truss structure, along with a third set of solar arrays and batteries. The crew of six astronauts will install the truss to continue assembly of the station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- At Launch Complex 39, STS-117 Mission Specialist James Reilly is helmeted and ready to practice driving an M-113 armored personnel carrier. The astronauts on the STS-117 crew are participating in M-113 armored personnel carrier training during Terminal Countdown Demonstration Test (TCDT) activities, a dress rehearsal for their launch, targeted for March 15. The M-113 could be used to move the crew away from the launch pad quickly in the event of an emergency. The TCDT also includes pad emergency egress training and a simulated launch countdown. The mission payload aboard Space Shuttle Atlantis is the S3/S4 integrated truss structure, along with a third set of solar arrays and batteries. The crew of six astronauts will install the truss to continue assembly of the station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- At Launch Complex 39, STS-117 Mission Specialist Patrick Forrester is helmeted and ready to practice driving an M-113 armored personnel carrier. The astronauts on the STS-117 crew are participating in M-113 armored personnel carrier training during Terminal Countdown Demonstration Test (TCDT) activities, a dress rehearsal for their launch, targeted for March 15. The M-113 could be used to move the crew away from the launch pad quickly in the event of an emergency. The TCDT also includes pad emergency egress training and a simulated launch countdown. The mission payload aboard Space Shuttle Atlantis is the S3/S4 integrated truss structure, along with a third set of solar arrays and batteries. The crew of six astronauts will install the truss to continue assembly of the station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- At Launch Complex 39, STS-117 Mission Specialist Danny Olivas is helmeted and ready to practice driving an M-113 armored personnel carrier. The astronauts on the STS-117 crew are participating in M-113 armored personnel carrier training during Terminal Countdown Demonstration Test (TCDT) activities, a dress rehearsal for their launch, targeted for March 15. The M-113 could be used to move the crew away from the launch pad quickly in the event of an emergency. The TCDT also includes pad emergency egress training and a simulated launch countdown. The mission payload aboard Space Shuttle Atlantis is the S3/S4 integrated truss structure, along with a third set of solar arrays and batteries. The crew of six astronauts will install the truss to continue assembly of the station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- At Launch Complex 39, STS-117 Commander Rick Sturckow signals that he is ready to practice driving an M-113 armored personnel carrier. The astronauts on the STS-117 crew are participating in M-113 armored personnel carrier training during Terminal Countdown Demonstration Test (TCDT) activities, a dress rehearsal for their launch, targeted for March 15. The M-113 could be used to move the crew away from the launch pad quickly in the event of an emergency. The TCDT also includes pad emergency egress training and a simulated launch countdown. The mission payload aboard Space Shuttle Atlantis is the S3/S4 integrated truss structure, along with a third set of solar arrays and batteries. The crew of six astronauts will install the truss to continue assembly of the station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- At Launch Complex 39, members of the STS-117 crew are instructed in the operation of an M-113 armored personnel carrier by the astronaut rescue team. The astronauts on the STS-117 crew are participating in M-113 armored personnel carrier training during Terminal Countdown Demonstration Test (TCDT) activities, a dress rehearsal for their launch, targeted for March 15. The M-113 could be used to move the crew away from the launch pad quickly in the event of an emergency. The TCDT also includes pad emergency egress training and a simulated launch countdown. The mission payload aboard Space Shuttle Atlantis is the S3/S4 integrated truss structure, along with a third set of solar arrays and batteries. The crew of six astronauts will install the truss to continue assembly of the station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- At Launch Complex 39, STS-117 Mission Specialist Patrick Forrester (right) waits his turn to practice driving an M-113 armored personnel carrier as fellow crew members look on. The astronauts on the STS-117 crew are participating in M-113 armored personnel carrier training during Terminal Countdown Demonstration Test (TCDT) activities, a dress rehearsal for their launch, targeted for March 15. The M-113 could be used to move the crew away from the launch pad quickly in the event of an emergency. The TCDT also includes pad emergency egress training and a simulated launch countdown. The mission payload aboard Space Shuttle Atlantis is the S3/S4 integrated truss structure, along with a third set of solar arrays and batteries. The crew of six astronauts will install the truss to continue assembly of the station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, Fla. -- STS-118 Commander Scott Kelly stands inside an M-113 armored personnel carrier before his driving session as part of emergency exit training. He and other crew members are at Kennedy for the Terminal Countdown Demonstration Test (TCDT), a dress rehearsal for launch. TCDT activities include the M-113 training, payload familiarization, emergency egress training at the pad and a simulated launch countdown. The STS-118 payload aboard Space Shuttle Endeavour includes the S5 truss, a SPACEHAB module and external stowage platform 3. The mission is the 22nd flight to the International Space Station and is targeted for launch on Aug.7. NASA/George Shelton

KENNEDY SPACE CENTER, Fla. -- STS-118 Commander Scott Kelly practices driving an M-113 armored personnel carrier with fellow crew members Tracy Caldwell, Alvin Drew and Dave Williams, all mission specialists, as passengers. They are at Kennedy for the Terminal Countdown Demonstration Test (TCDT), a dress rehearsal for launch. TCDT activities include the M-113 training, payload familiarization, emergency egress training at the pad and a simulated launch countdown. The STS-118 payload aboard Space Shuttle Endeavour includes the S5 truss, a SPACEHAB module and external stowage platform 3. The mission is the 22nd flight to the International Space Station and is targeted for launch on Aug.7. NASA/George Shelton

KENNEDY SPACE CENTER, Fla. -- STS-118 Pilot Charlie Hobaugh stands inside an M-113 armored personnel carrier before his driving session as part of emergency exit training. He and other crew members are at Kennedy for the Terminal Countdown Demonstration Test (TCDT), a dress rehearsal for launch. TCDT activities include the M-113 training, payload familiarization, emergency egress training at the pad and a simulated launch countdown. The STS-118 payload aboard Space Shuttle Endeavour includes the S5 truss, a SPACEHAB module and external stowage platform 3. The mission is the 22nd flight to the International Space Station and is targeted for launch on Aug.7. NASA/George Shelton

KENNEDY SPACE CENTER, Fla. -- STS-118 Mission Specialist Alvin Drew stands inside an M-113 armored personnel carrier before his driving session, as part of emergency exit training. He and other crew members are at Kennedy for the Terminal Countdown Demonstration Test (TCDT), a dress rehearsal for launch. TCDT activities include the M-113 training, payload familiarization, emergency egress training at the pad and a simulated launch countdown. The STS-118 payload aboard Space Shuttle Endeavour includes the S5 truss, a SPACEHAB module and external stowage platform 3. The mission is the 22nd flight to the International Space Station and is targeted for launch on Aug.7. NASA/George Shelton

KENNEDY SPACE CENTER, Fla. -- STS-118 Pilot Charlie Hobaugh practices driving an M-113 armored personnel carrier with passenger (at left) Tracy Caldwell, mission specialist. They and other crew members are at Kennedy for the Terminal Countdown Demonstration Test (TCDT), a dress rehearsal for launch. TCDT activities include the M-113 training, payload familiarization, emergency egress training at the pad and a simulated launch countdown. The STS-118 payload aboard Space Shuttle Endeavour includes the S5 truss, a SPACEHAB module and external stowage platform 3. The mission is the 22nd flight to the International Space Station and is targeted for launch on Aug.7. NASA/George Shelton

CAPE CANAVERAL, Fla. - The STS-125 crew members listen to instructions for driving the M-113 armored personnel carrier. From left are Mission Specialists John Grunsfeld, Megan McArthur, Michael Good, Mike Massimino and Gregory C. Johnson. The crew members of space shuttle Atlantis' STS-125 mission will each practice driving the M-113 in turn as part of their training on emergency egress procedures. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a dress launch rehearsal called the terminal countdown demonstration test, or TCDT. It provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization, emergency training and a simulated launch countdown. The STS-125 mission aboard space shuttle Atlantis to service NASA’s Hubble Space Telescope is targeted to launch Oct. 10. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - STS-125 Commander Scott Altman is ready to practice driving the M-113 armored personnel carrier. The crew members of space shuttle Atlantis' STS-125 mission will each practice driving the M-113 in turn as part of their training on emergency egress procedures. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a dress launch rehearsal called the terminal countdown demonstration test, or TCDT. It provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization, emergency training and a simulated launch countdown. The STS-125 mission aboard space shuttle Atlantis to service NASA’s Hubble Space Telescope is targeted to launch Oct. 10. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - The STS-125 crew members listen to instructions for driving the M-113 armored personnel carrier. From left are Mission Specialists Megan McArthur, Mike Massimino and Michael Good. The crew members of space shuttle Atlantis' STS-125 mission will each practice driving the M-113 in turn as part of their training on emergency egress procedures. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a dress launch rehearsal called the terminal countdown demonstration test, or TCDT. It provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization, emergency training and a simulated launch countdown. The STS-125 mission aboard space shuttle Atlantis to service NASA’s Hubble Space Telescope is targeted to launch Oct. 10. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - STS-125 Mission Specialist Megan McArthur practices driving the M-113 armored personnel carrier. Other crew members are behind her. The crew members of space shuttle Atlantis' STS-125 mission will each practice driving the M-113 in turn as part of their training on emergency egress procedures. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a dress launch rehearsal called the terminal countdown demonstration test, or TCDT. It provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization, emergency training and a simulated launch countdown. The STS-125 mission aboard space shuttle Atlantis to service NASA’s Hubble Space Telescope is targeted to launch Oct. 10. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - STS-125 Pilot Gregory C. Johnson practices driving the M-113 armored personnel carrier. Behind him are other crew members. The crew members of space shuttle Atlantis' STS-125 mission will each practice driving the M-113 in turn as part of their training on emergency egress procedures. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a dress launch rehearsal called the terminal countdown demonstration test, or TCDT. It provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization, emergency training and a simulated launch countdown. The STS-125 mission aboard space shuttle Atlantis to service NASA’s Hubble Space Telescope is targeted to launch Oct. 10. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - STS-125 Mission Specialist John Grunsfeld is ready to practice driving the M-113 armored personnel carrier. The crew members of space shuttle Atlantis' STS-125 mission will each practice driving the M-113 in turn as part of their training on emergency egress procedures. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a dress launch rehearsal called the terminal countdown demonstration test, or TCDT. It provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization, emergency training and a simulated launch countdown. The STS-125 mission aboard space shuttle Atlantis to service NASA’s Hubble Space Telescope is targeted to launch Oct. 10. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - STS-125 Pilot Gregory C. Johnson is ready to practice driving the M-113 armored personnel carrier. The crew members of space shuttle Atlantis' STS-125 mission will each practice driving the M-113 in turn as part of their training on emergency egress procedures. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a dress launch rehearsal called the terminal countdown demonstration test, or TCDT. It provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization, emergency training and a simulated launch countdown. The STS-125 mission aboard space shuttle Atlantis to service NASA’s Hubble Space Telescope is targeted to launch Oct. 10. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-116 Mission Specialist Robert Curbeam practices driving the M-113 armored personnel carrier. The mission crew is at KSC for terminal countdown demonstration test (TCDT) activities that are preparation for launch. The M-113 could be used to move the crew quickly away from the launch pad in the event of an emergency. At left of Polansky is Capt. George Hoggard, who is astronaut rescue team leader. In the back of the M-113, at right, is Commander Mark Polansky. The STS-116 mission is No. 20 to the International Space Station and construction flight 12A.1. The mission payload is the SPACEHAB module, the P5 integrated truss structure and other key components. Launch is scheduled for no earlier than Dec. 7. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - An STS-125 crew member affixes a mission patch to the inside of the M-113 armored personnel carrier the crew practiced driving.The crew members of space shuttle Atlantis' STS-125 mission each practiced driving the M-113 in turn as part of their training on emergency egress procedures. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a dress launch rehearsal called the terminal countdown demonstration test, or TCDT. It provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization, emergency training and a simulated launch countdown. The STS-125 mission aboard space shuttle Atlantis to service NASA’s Hubble Space Telescope is targeted to launch Oct. 10. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - STS-125 Mission Specialist Mike Massimino is ready to practice driving the M-113 armored personnel carrier. The crew members of space shuttle Atlantis' STS-125 mission will each practice driving the M-113 in turn as part of their training on emergency egress procedures. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a dress launch rehearsal called the terminal countdown demonstration test, or TCDT. It provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization, emergency training and a simulated launch countdown. The STS-125 mission aboard space shuttle Atlantis to service NASA’s Hubble Space Telescope is targeted to launch Oct. 10. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - STS-125 Mission Specialist Michael Good practices driving the M-113 armored personnel carrier. Other crew members are behind him. The crew members of space shuttle Atlantis' STS-125 mission will each practice driving the M-113 in turn as part of their training on emergency egress procedures. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a dress launch rehearsal called the terminal countdown demonstration test, or TCDT. It provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization, emergency training and a simulated launch countdown. The STS-125 mission aboard space shuttle Atlantis to service NASA’s Hubble Space Telescope is targeted to launch Oct. 10. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - STS-125 Mission Specialist Andrew Feustel is ready to practice driving the M=113 armored personnel carrier. The crew members of space shuttle Atlantis' STS-125 mission will each practice driving the M-113 in turn as part of their training on emergency egress procedures. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a dress launch rehearsal called the terminal countdown demonstration test, or TCDT. It provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization, emergency training and a simulated launch countdown. The STS-125 mission aboard space shuttle Atlantis to service NASA’s Hubble Space Telescope is targeted to launch Oct. 10. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - STS-125 Mission Specialist Mike Massimino practices driving the M-113 armored personnel carrier. Behind him are other crew members. The crew members of space shuttle Atlantis' STS-125 mission will each practice driving the M-113 in turn as part of their training on emergency egress procedures. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a dress launch rehearsal called the terminal countdown demonstration test, or TCDT. It provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization, emergency training and a simulated launch countdown. The STS-125 mission aboard space shuttle Atlantis to service NASA’s Hubble Space Telescope is targeted to launch Oct. 10. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - STS-125 Mission Specialist Michael Good is ready to practice driving the M-113 armored personnel carrier. The crew members of space shuttle Atlantis' STS-125 mission will each practice driving the M-113 in turn as part of their training on emergency egress procedures. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a dress launch rehearsal called the terminal countdown demonstration test, or TCDT. It provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization, emergency training and a simulated launch countdown. The STS-125 mission aboard space shuttle Atlantis to service NASA’s Hubble Space Telescope is targeted to launch Oct. 10. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - STS-125 Mission Specialist Megan McArthur is ready to practice driving the M-113 armored personnel carrier. The crew members of space shuttle Atlantis' STS-125 mission will each practice driving the M-113 in turn as part of their training on emergency egress procedures. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a dress launch rehearsal called the terminal countdown demonstration test, or TCDT. It provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization, emergency training and a simulated launch countdown. The STS-125 mission aboard space shuttle Atlantis to service NASA’s Hubble Space Telescope is targeted to launch Oct. 10. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – At NASA's Kennedy Space Center in Florida, STS-128 Pilot Kevin Ford drives an M-113 armored personnel carrier. At far left is Commander Rick Sturckow. Other crew members will take their turns at driving the M-113. The crew members of space shuttle Discovery's STS-128 mission are taking turns driving the M-113, which will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at Kennedy for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes emergency exit training and equipment familiarization, as well as a simulated launch countdown. Launch of le Discovery is targeted for late August. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - STS-125 Commander Scott Altman practices driving the M-113 armored personnel carrier. Behind him are other crew members. The crew members of space shuttle Atlantis' STS-125 mission will each practice driving the M-113 in turn as part of their training on emergency egress procedures. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a dress launch rehearsal called the terminal countdown demonstration test, or TCDT. It provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization, emergency training and a simulated launch countdown. The STS-125 mission aboard space shuttle Atlantis to service NASA’s Hubble Space Telescope is targeted to launch Oct. 10. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-116 Mission Specialist Christer Fuglesang practices driving the M-113 armored personnel carrier. Fuglesang represents the European Space Agency. The mission crew is at KSC for terminal countdown demonstration test (TCDT) activities that are preparation for launch. The M-113 could be used to move the crew quickly away from the launch pad in the event of an emergency. At left of Fuglesang is Capt. George Hoggard, who is astronaut rescue team leader. Other crew members on the M-113, behind Hoggard, are Mission Specialist Sunita Williams, Pilot William Oefelein and Nicholas Patrick. In the background is Mission Specialist Joan Higginbotham. The STS-116 mission is No. 20 to the International Space Station and construction flight 12A.1. The mission payload is the SPACEHAB module, the P5 integrated truss structure and other key components. Launch is scheduled for no earlier than Dec. 7. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - STS-125 Mission Specialist John Grunsfeld practices driving the M-113 armored personnel carrier. Other crew members are behind him. The crew members of space shuttle Atlantis' STS-125 mission will each practice driving the M-113 in turn as part of their training on emergency egress procedures. An M-113 will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at NASA's Kennedy Space Center for a dress launch rehearsal called the terminal countdown demonstration test, or TCDT. It provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization, emergency training and a simulated launch countdown. The STS-125 mission aboard space shuttle Atlantis to service NASA’s Hubble Space Telescope is targeted to launch Oct. 10. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- The STS-113 crew pause for a photo after test drives in the M-113 armored personnel carrier behind them. From left are Mission Specialist Michael Lopez-Alegria, Pilot Paul Lockhart, Commander James Wetherbee and Mission Specialist John Herrington. Driving the M-113 is part of emergency egress training at the pad, one of the Terminal Countdown Demonstration Test activities in preparation for launch. The TCDT also includes a simulated launch countdown. The primary payloads on mission STS-113 are the first port truss segment, P1, and the Crew and Equipment Translation Aid (CETA) Cart B. Once delivered, the P1 truss will remain stowed until flight 12A.1 in 2003 when it will be attached to the central truss segment, S0, on the Space Station. Also onboard Space Shuttle Endeavour will be the Expedition 6 crew who will replace Expedition 5, returning to Earth after 4 months.

KENNEDY SPACE CENTER, FLA. -- STS-116 Commander Mark Polansky is ready for his turn at driving the M-113 armored personnel carrier. The mission crew is at KSC for terminal countdown demonstration test (TCDT) activities that are preparation for launch. The M-113 could be used to move the crew quickly away from the launch pad in the event of an emergency. Behind Polansky is Mission Specialist Robert Curbeam. The STS-116 mission is No. 20 to the International Space Station and construction flight 12A.1. The mission payload is the SPACEHAB module, the P5 integrated truss structure and other key components. Launch is scheduled for no earlier than Dec. 7. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-116 Mission Specialist Joan Higginbotham is helmeted and ready to practice driving the M-113 armored personnel carrier. The mission crew is at KSC for terminal countdown demonstration test (TCDT) activities that are preparation for launch. The M-113 could be used to move the crew quickly away from the launch pad in the event of an emergency. In the background is Mission Specialist Nicholas Patrick. The STS-116 mission is No. 20 to the International Space Station and construction flight 12A.1. The mission payload is the SPACEHAB module, the P5 integrated truss structure and other key components. Launch is scheduled for no earlier than Dec. 7. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – At NASA's Kennedy Space Center in Florida, STS-128 Pilot Kevin Ford has completed his turn at driving an M-113 armored personnel carrier. The crew members of space shuttle Discovery's STS-128 mission are taking turns driving the M-113, which will be available to transport the crew to safety in the event of a contingency on the pad before their launch. The crew is at Kennedy for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes emergency exit training and equipment familiarization, as well as a simulated launch countdown. Launch of Discovery is targeted for late August. Photo credit: NASA/Kim Shiflett