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KENNEDY SPACE CENTER, FLA. -- In the payload changeout room on Launch Pad 39B, STS-116 crew members look over the mission payload with payload managers one more time before launch. At left is Pilot William Oefelein. Second from right is Mission Specialist Robert Curbeam. The crew is at KSC to take part in Terminal Countdown Demonstration Test activities, which include emergency egress training, a simulated launch countdown and payload familiarization. The TCDT is part of prelaunch preparations for the mission that is scheduled to lift off in a window opening no earlier than Dec. 7. The STS-116 mission is No. 20 to the International Space Station and construction flight 12A.1. The mission payload is the SPACEHAB module, the P5 integrated truss structure and other key components. Photo credit: NASA/Kim Shiflett