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KENNEDY SPACE CENTER, FLA. - After a three-day series of Terminal Countdown Demonstration Test (TCDT) activities, the crew of mission STS-121 are leaving NASA's Kennedy Space Center to return to Houston. Waving on her way to the plane at the Shuttle Landing Facility is Mission Specialist Stephanie Wilson. The TCDT includes equipment familiarization, emergency egress training and a simulated launch countdown. Mission STS-121 is scheduled to launch July 1. Photo credit: NASA/Kim Shiflett