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KENNEDY SPACE CENTER, FLA. -- The STS-116 mission crew practices for launch with a simulation of activities, from crew breakfast and suit-up to countdown in the orbiter. In this photo Commander Mark Polansky is helped with his helmet before heading to Launch Pad 39B. 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. Launch is scheduled for no earlier than Dec. 7. Photo credit: NASA/Kim Shiflett