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KENNEDY SPACE CENTER, FLA. -- Dressed in their flights suits, the Mission STS-117 crew members practice walk out from the Operations and Checkout Building to the astronaut van for transport to Launch Pad 39A during terminal countdown demonstration test activities. From the left are Mission Specialists Danny Olivas, Steven Swanson and James Reilly (behind Swanson), Pilot Lee Archambault, Mission Specialist Patrick Forrester, and Commander Rick Sturckow is leading the way. 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.