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KENNEDY SPACE CENTER, FLA. -- During Terminal Countdown Demonstration Test activities, the Mission STS-117 crew members participate in an emergency egress walkdown at Launch Pad 39A. On the 195-foot level of the fixed service structure inside the white room are Mission Specialist Steven Swanson (kneeling), and standing from left, Pilot Lee Archambault, Commander Rick Sturckow, and Mission Specialists Patrick Forrester, Danny Olivas and James Reilly. The TCDT also includes M-113 armored personnel carrier 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 International Space Station. Photo credit: NASA/Kim Shiflett