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KENNEDY SPACE CENTER, FLA. -- On NASA Kennedy Space Center's Launch Pad 39A, STS-123 Mission Specialist Takao Doi looks over the payload in space shuttle Endeavour's payload bay. Doi represents the Japan Aerospace and Exploration Agency, or JAXA. He and other STS-123 crew members are at Kennedy for a full launch dress rehearsal, known as the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Endeavour is targeted to launch March 11 at 2:28 a.m. EDT 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