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KENNEDY SPACE CENTER, FLA. -- During Terminal Countdown Demonstration Test (TCDT) activities at Launch Pad 39A, the Mission STS-117 crew members speak to the media during a question-and-answer session. From the left are Mission Specialists James Reilly, Danny Olivas, Steven Swanson and Patrick Forrester, Pilot Lee Archambault and Commander Rick Sturckow, along with NASA Public Affairs Specialist Jessica Rye. The TCDT also includes M-113 armored personnel carrier training, pad emergency egress 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