In the White Room on the orbiter access arm of the fixed service structure on Launch Pad 39A at NASA's Kennedy Space Center in Florida, STS-127 Mission Specialists Christopher Cassidy and Dave Wolf share good wishes before entering space shuttle Endeavour for the simulated launch countdown. The crew is at Kennedy for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes the simulation, emergency exit training and equipment familiarization. NASA/TROY CRYDER / Special to the Tribune-Star Order photo reprints
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