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KENNEDY SPACE CENTER, FLA. -- In the White Room on NASA Kennedy Space Center's Launch Pad 39A, STS-123 Mission Specialist Rick Linnehan is getting ready to enter space shuttle Endeavour for the simulated launch countdown. Behind him is Mission Specialist Pilot Gregory H. Johnson. The countdown is 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/Jim Grossmann