CAPE CANAVERAL, Fla. – On Launch Pad 39A at NASA's Kennedy Space Center in Florida, STS-119 crew members listen to instructions about using the slidewire baskets for emergency egress from the fixed service structure. From left are Mission Specialists Steve Swanson and Joseph Acaba, Pilot Tony Antonelli, Mission specialist John Phillips, Commander Lee Archambault and Mission Specialists Richard Arnold and Koichi Wakata. The astronauts are at Kennedy to prepare for launch as part of the Terminal Countdown Demonstration Test activities. The TCDT includes equipment familiarization and a simulated launch countdown. The crew of space shuttle Discovery is targeted to launch on the STS-119 mission Feb. 12. During Discovery's 14-day mission, the crew will install the S6 truss segment and solar arrays to the starboard side of the International Space Station, completing the station's truss, or backbone. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – On the fixed service structure on Launch Pad 39A at NASA's Kennedy Space Center in Florida, STS-119 crew members learn about slidewire basket procedures as part of emergency egress training. At left are Commander Lee Archambault and Mission Specialists Steve Swanson and John Phillips. At right, from foreground, are Mission Specialists Richard Arnold and Joseph Acaba, and Pilot Tony Antonelli. The astronauts are at Kennedy to prepare for launch as part of the Terminal Countdown Demonstration Test activities. The TCDT includes equipment familiarization and a simulated launch countdown. The crew of space shuttle Discovery is targeted to launch on the STS-119 mission Feb. 12. During Discovery's 14-day mission, the crew will install the S6 truss segment and solar arrays to the starboard side of the International Space Station, completing the station's truss, or backbone. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – On the fixed service structure on Launch Pad 39A at NASA's Kennedy Space Center in Florida, STS-119 crew members learn about slidewire basket procedures as part of emergency egress training. From left are Mission Specialist Steve Swanson, Commander Lee Archambault, Mission Specialists John Phillips, Koichi Wakata, and (behind the trainer) Richard Arnold and Joseph Acaba. The astronauts are at Kennedy to prepare for launch as part of the Terminal Countdown Demonstration Test activities. The TCDT includes equipment familiarization and a simulated launch countdown. The crew of space shuttle Discovery is targeted to launch on the STS-119 mission Feb. 12. During Discovery's 14-day mission, the crew will install the S6 truss segment and solar arrays to the starboard side of the International Space Station, completing the station's truss, or backbone. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – The STS-119 crew members gather in front of the hatch into space shuttle Discovery to place the mission plaque. Standing from left are Mission Specialists Joseph Acaba, Koichi Wakata, Steve Swanson, John Phillips and Richard Arnold and Pilot Tony Antonelli. Kneeling in front is Commander Lee Archambault. The astronauts are at Kennedy to prepare for launch as part of the Terminal Countdown Demonstration Test activities. The TCDT includes equipment familiarization and a simulated launch countdown. The crew of space shuttle Discovery is targeted to launch on the STS-119 mission Feb. 12. During Discovery's 14-day mission, the crew will install the S6 truss segment and solar arrays to the starboard side of the International Space Station, completing the station's truss, or backbone. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – The STS-119 crew members gather on Launch Pad 39A at NASA's Kennedy Space Center in Florida before beginning their emergency egress training. From left are Mission Specialists Koichi Wakata, Steve Swanson and Joseph Acaba, Pilot Tony Antonelli, Commander Lee Archambault and Mission Specialists Richard Arnold and John Phillips. The astronauts are at Kennedy to prepare for launch as part of the Terminal Countdown Demonstration Test activities. The TCDT includes equipment familiarization and a simulated launch countdown. The crew of space shuttle Discovery is targeted to launch on the STS-119 mission Feb. 12. During Discovery's 14-day mission, the crew will install the S6 truss segment and solar arrays to the starboard side of the International Space Station, completing the station's truss, or backbone. Photo credit: NASA_Kim Shiflett

CAPE CANAVERAL, Fla. – On the fixed service structure on Launch Pad 39A at NASA's Kennedy Space Center in Florida, STS-119 crew members listen to a trainer about emergency egress procedures from the slidewire basket area. From left are Commander Lee Archambault and Mission Specialists Steve Swanson, John Phillips and Koichi Wakata. The astronauts are at Kennedy to prepare for launch as part of the Terminal Countdown Demonstration Test activities. The TCDT includes equipment familiarization and a simulated launch countdown. The crew of space shuttle Discovery is targeted to launch on the STS-119 mission Feb. 12. During Discovery's 14-day mission, the crew will install the S6 truss segment and solar arrays to the starboard side of the International Space Station, completing the station's truss, or backbone. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – The STS-119 crew members gather on the fixed service structure on Launch Pad 39A at NASA's Kennedy Space Center in Florida to listen to the trainer about emergency egress procedures. Left of center is Mission Specialist John Phillips; on the right are Mission Specialists Richard Arnold, Steve Swanson and Joseph Acaba and Commander Lee Archambault. The astronauts are at Kennedy to prepare for launch as part of the Terminal Countdown Demonstration Test activities. The TCDT includes equipment familiarization and a simulated launch countdown. The crew of space shuttle Discovery is targeted to launch on the STS-119 mission Feb. 12. During Discovery's 14-day mission, the crew will install the S6 truss segment and solar arrays to the starboard side of the International Space Station, completing the station's truss, or backbone. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – On the fixed service structure on Launch Pad 39A at NASA's Kennedy Space Center in Florida, STS-119 Mission Specialist Richard Arnold leans toward the lever in the slidewire basket, part of the emergency egress equipment. At right, Commander Lee Archambault watches. The astronauts are at Kennedy to prepare for launch as part of the Terminal Countdown Demonstration Test activities. The TCDT includes equipment familiarization and a simulated launch countdown. The crew of space shuttle Discovery is targeted to launch on the STS-119 mission Feb. 12. During Discovery's 14-day mission, the crew will install the S6 truss segment and solar arrays to the starboard side of the International Space Station, completing the station's truss, or backbone. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – The STS-119 crew members gather on the fixed service structure on Launch Pad 39A at NASA's Kennedy Space Center in Florida to start their emergency egress training. At left is Mission Specialist Steve Swanson; in the background is Commander Lee Archambault; on the right (from center) are Mission Specialists Richard Arnold and John Phillips, Pilot Tony Antonelli and Mission Specialist Koichi Wakata. The astronauts are at Kennedy to prepare for launch as part of the Terminal Countdown Demonstration Test activities. The TCDT includes equipment familiarization and a simulated launch countdown. The crew of space shuttle Discovery is targeted to launch on the STS-119 mission Feb. 12. During Discovery's 14-day mission, the crew will install the S6 truss segment and solar arrays to the starboard side of the International Space Station, completing the station's truss, or backbone. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – On Launch Pad 39A at NASA's Kennedy Space Center in Florida, STS-119 crew members gather in front of the bunker to continue emergency egress training. From left are Mission Specialists Joseph Acaba and Richard Arnold, Pilot Tony Antonelli, and Mission Specialists Koichi Wakata, Steve Swanson (behind Wakata) and John Phillips (at right). The astronauts are at Kennedy to prepare for launch as part of the Terminal Countdown Demonstration Test activities. The TCDT includes equipment familiarization and a simulated launch countdown. The crew of space shuttle Discovery is targeted to launch on the STS-119 mission Feb. 12. During Discovery's 14-day mission, the crew will install the S6 truss segment and solar arrays to the starboard side of the International Space Station, completing the station's truss, or backbone. Photo credit: NASA/Kim Shiflett