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KENNEDY SPACE CENTER, FLA. -- In the Launch Pad 39A area, Mission STS-117 crew members receive instruction on emergency egress using the slidewire basket system during Terminal Countdown Demonstration Test activities. From left are Commander Rick Sturckow, Mission Specialists Patrick Forrester and Danny Olivas, Pilot Lee Archambault, and Mission Specialists James Reilly and Steven Swanson. 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