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-116 Mission Specialist Joan Higginbotham practices driving the M-113 armored personnel carrier away from Launch Pad 39B. On the M-113, Pilot William Oefelein is at left and Capt. George Hoggard, who is astronaut rescue team leader, in between Oefelein and Higginbotham. In the background is the fixed service structure, with the 80-foot-tall lightning mast on top, and Space Shuttle Discovery -- only the orange external tank can be seen. 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. 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. -- On the top level of the Pad 39A fixed service structure, the STS-118 crew takes a break from training activities in the terminal countdown demonstration test, or TCDT. From left are Mission Specialists Dave Williams, Tracy Caldwell, Barbara R. Morgan and Alvin Drew, Pilot Charlie Hobaugh, Commander Scott Kelly and Mission Specialist Rick Mastracchio. Williams represents the Canadian Space Agency. Morgan joined NASA's Teacher in Space program in 1985 and was selected as an astronaut in 1998. Behind them is the top of the external tank. TCDTactivities include M-113 training, payload familiarization, the emergency egress training at the pad and a simulated launch countdown. The mission is the 22nd flight to the International Space Station and Space Shuttle Endeavour will carry a payload including the S5 truss, a SPACEHAB module and external stowage platform 3. STS-118 is targeted for launch on Aug. 7. NASA/George Shelton

STS-91 Mission Specialist Wendy B. Lawrence is learning how to operate an M-113 armored personnel carrier during Terminal Countdown Demonstration Test (TCDT) training activities. The TCDT is held at KSC prior to each Space Shuttle flight to provide crews with an opportunity to participate in simulated countdown activities. STS-91 is scheduled to be launched on June 2 with a launch window opening around 6:10 p.m. EDT. The mission will feature the ninth Shuttle docking with the Russian Space Station Mir, the first Mir docking for Discovery, the conclusion of Phase I of the joint U.S.-Russian International Space Station Program, and the first flight of the new Space Shuttle super lightweight external tank. The STS-91 flight crew also includes Commander Charles Precourt; Pilot Dominic Gorie; and Mission Specialists Franklin Chang-Diaz, Ph.D.; Janet Kavandi, Ph.D.; and Valery Ryumin, with the Russian Space Agency. Andrew Thomas, Ph.D., will be returning to Earth with the crew after living more than four months aboard Mir

STS-91 Mission Specialist Janet Kavandi, Ph.D., is learning how to operate an M-113 armored personnel carrier during Terminal Countdown Demonstration Test (TCDT) training activities. The TCDT is held at KSC prior to each Space Shuttle flight to provide crews with an opportunity to participate in simulated countdown activities. STS-91 is scheduled to be launched on June 2 with a launch window opening around 6:10 p.m. EDT. The mission will feature the ninth Shuttle docking with the Russian Space Station Mir, the first Mir docking for Discovery, the conclusion of Phase I of the joint U.S.-Russian International Space Station Program, and the first flight of the new Space Shuttle super lightweight external tank. The STS-91 flight crew also includes Commander Charles Precourt; Pilot Dominic Gorie; and Mission Specialists Wendy B. Lawrence; Franklin Chang-Diaz, Ph.D.; and Valery Ryumin, with the Russian Space Agency. Andrew Thomas, Ph.D., will be returning to Earth with the crew after living more than four months aboard Mir

KENNEDY SPACE CENTER, FLA. -- On the 215-foot level of the fixed service structure on Launch Pad 39A, Mission STS-117 crew members gather for a photo near the solid rocket boosters and external tank of Space Shuttle Atlantis. They have just completed a simulated launch countdown and emergency egress from the orbiter, part of the terminal countdown demonstration test (TCDT). From left are Mission Specialists Danny Olivas and Steven Swanson, Pilot Lee Archambault, Commander Rick Sturckow, and Mission Specialists Patrick Forrester and James Reilly. The TCDT also includes M-113 armored personnel carrier training and payload familiarization. The STS-117 mission is No. 21 to the International Space Station. Mission payloads aboard Atlantis include the S3/S4 integrated truss structure, a third set of solar arrays and batteries. The crew of six astronauts will install the truss to continue assembly of the station. Launch is scheduled for no earlier than March 15. Photo credit: NASA/Kim Shiflett.

STS-91 Pilot Dominic Gorie is learning how to operate an M-113 armored personnel carrier during Terminal Countdown Demonstration Test (TCDT) training activities. The TCDT is held at KSC prior to each Space Shuttle flight to provide crews with an opportunity to participate in simulated countdown activities. STS-91 is scheduled to be launched on June 2 with a launch window opening around 6:10 p.m. EDT. The mission will feature the ninth Shuttle docking with the Russian Space Station Mir, the first Mir docking for Discovery, the conclusion of Phase I of the joint U.S.-Russian International Space Station Program, and the first flight of the new Space Shuttle super lightweight external tank. The STS-91 flight crew also includes Commander Charles Precourt and Mission Specialists Wendy B. Lawrence; Franklin Chang-Diaz, Ph.D.; Janet Kavandi, Ph.D.; and Valery Ryumin, with the Russian Space Agency. Andrew Thomas, Ph.D., will be returning to Earth with the crew after living more than four months aboard Mir

STS-91 Mission Commander Charles Precourt is learning how to operate an M-113 armored personnel carrier during Terminal Countdown Demonstration Test (TCDT) training activities. The TCDT is held at KSC prior to each Space Shuttle flight to provide crews with an opportunity to participate in simulated countdown activities. STS-91 is scheduled to be launched on June 2 with a launch window opening around 6:10 p.m. EDT. The mission will feature the ninth Shuttle docking with the Russian Space Station Mir, the first Mir docking for Discovery, the conclusion of Phase I of the joint U.S.-Russian International Space Station Program, and the first flight of the new Space Shuttle super lightweight external tank. The STS-91 flight crew also includes Pilot Dominic Gorie and Mission Specialists Wendy B. Lawrence; Franklin Chang-Diaz, Ph.D.; Janet Kavandi, Ph.D.; and Valery Ryumin, with the Russian Space Agency. Andrew Thomas, Ph.D., will be returning to Earth with the crew after living more than four months aboard Mir

STS-91 Mission Specialist Valery Ryumin, with the Russian Space Agency, is learning how to operate an M-113 armored personnel carrier during Terminal Countdown Demonstration Test (TCDT) training activities. The TCDT is held at KSC prior to each Space Shuttle flight to provide crews with an opportunity to participate in simulated countdown activities. STS-91 is scheduled to be launched on June 2 with a launch window opening around 6:10 p.m. EDT. The mission will feature the ninth Shuttle docking with the Russian Space Station Mir, the first Mir docking for Discovery, the conclusion of Phase I of the joint U.S.-Russian International Space Station Program, and the first flight of the new Space Shuttle super lightweight external tank. The STS-91 flight crew includes Commander Charles Precourt; Pilot Dominic Gorie; and Mission Specialists Wendy B. Lawrence; Franklin Chang-Diaz, Ph.D.; and Janet Kavandi, Ph.D. Andrew Thomas, Ph.D., will be returning to Earth with the crew after living more than four months aboard Mir

KENNEDY SPACE CENTER, Fla. -- The STS-118 crew poses for a photo on Launch Pad 39A during training activities in the terminal countdown demonstration test, or TCDT. From left are Mission Specialists Dave Williams and Barbara R. Morgan, Commander Scott Kelly, Mission Specialist Alvin Drew, Pilot Charlie Hobaugh, and Mission Specialists Rick Mastracchio and Tracy Caldwell. Williams represents the Canadian Space Agency. Morgan joined NASA's Teacher in Space program in 1985 and was selected as an astronaut in 1998. Behind them can be seen the solid rocket boosters and external tank of Space Shuttle Endeavour atop the mobile launcher platform. TCDT activities include M-113 training, payload familiarization, the emergency egress training at the pad and a simulated launch countdown. The mission is the 22nd flight to the International Space Station and Space Shuttle Endeavour will carry a payload including the S5 truss, a SPACEHAB module and external stowage platform 3. STS-118 is targeted for launch on Aug. 7. Photo credit: NASA/George Shelton

STS-91 Mission Specialist Franklin Chang-Diaz, Ph.D., is learning how to operate an M-113 armored personnel carrier during Terminal Countdown Demonstration Test (TCDT) training activities. The TCDT is held at KSC prior to each Space Shuttle flight to provide crews with an opportunity to participate in simulated countdown activities. STS-91 is scheduled to be launched on June 2 with a launch window opening around 6:10 p.m. EDT. The mission will feature the ninth Shuttle docking with the Russian Space Station Mir, the first Mir docking for Discovery, the conclusion of Phase I of the joint U.S.-Russian International Space Station Program, and the first flight of the new Space Shuttle super lightweight external tank. The STS-91 flight crew also includes Commander Charles Precourt; Pilot Dominic Gorie; and Mission Specialists Wendy B. Lawrence; Janet Kavandi, Ph.D.; and Valery Ryumin, with the Russian Space Agency. Andrew Thomas, Ph.D., will be returning to Earth with the crew after living more than four months aboard Mir

KENNEDY SPACE CENTER, Fla. -- On the top level of the Pad 39A fixed service structure, the STS-118 crew takes a break from training activities in the terminal countdown demonstration test, or TCDT. From left are Mission Specialist Dave Williams, Pilot Charlie Hobaugh, Mission Specialist Alvin Drew, Commander Scott Kelly and Mission Specialists Tracy Caldwell, Barbara R. Morgan and Rick Mastracchio. Williams represents the Canadian Space Agency. Morgan joined NASA's Teacher in Space program in 1985 and was selected as an astronaut in 1998. Behind them is the top of the external tank and a solid rocket booster. TCDTactivities include M-113 training, payload familiarization, the emergency egress training at the pad and a simulated launch countdown. The mission is the 22nd flight to the International Space Station and Space Shuttle Endeavour will carry a payload including the S5 truss, a SPACEHAB module and external stowage platform 3. STS-118 is targeted for launch on Aug. 7. NASA/George Shelton