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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.