The STS-116 crew walks out of the Operations and Checkout Building during the terminal countdown demonstration test.

The STS-116 crew walks out of the Operations and Checkout Building on their way to Launch Pad 39B during the terminal countdown demonstration test. The crew is practicing for launch with a simulation of activities, from crew breakfast and suit-up to countdown in the orbiter. Leading the way are Commander Mark Polansky (right) and Mission Specialist Joan Higginbotham (left). Behind them are (left and right) Mission Specialist Nicholas Patrick and Pilot William Oefelein; Mission Specialists Sunita Williams and Christer Fuglesang, who represents the European Space Agency; and Mission Specialist Robert Curbeam (right). 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