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KENNEDY SPACE CENTER, FLA. -- Gathered again on the top level of the fixed service structure, the STS-123 crew poses for a photo after completing the simulated launch countdown. From left are Mission Specialists Rick Linnehan and Robert L. Behnken, Pilot Gregory H. Johnson, Commander Dominic Gorie, and Mission Specialists Mike Foreman, Garrett Reisman and Takao Doi. 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