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KENNEDY SPACE CENTER, FLA. -- Following the simulated launch countdown, STS-123 crew members begin exiting space shuttle Endeavour into the White Room on Launch Pad 39 at NASA's Kennedy Space Center. To leave the pad, the STS-123 crew will practice emergency egress using the slidewire baskets. The countdown was the culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various countdown activities, including equipment familiarization and emergency egress training. Endeavour is targeted to launch at 2:28 a.m. EDT March 11 on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett