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KENNEDY SPACE CENTER, Fla. -- The STS-118 crew walks toward the Astrovan that will take them to Launch Pad 39A for a simulated launch countdown. From left are Mission Specialists Barbara R. Morgan and Rick Mastracchio, Pilot Charlie Hobaugh, Mission Specialists Dave Williams and Tracy Caldwell, and Commander Scott Kelly. Morgan joined NASA's Teacher in Space program in 1985 and was selected as an astronaut in 1998. The countdown concludes the terminal countdown demonstration test, or TCDT. The STS-118 crew has been at Kennedy for the TCDT activities that also include M-113 training, payload familiarization and emergency egress training at the pad. The mission is the 22nd flight to the International Space Station and Space Shuttle Endeavour will carry a payload including the S5 truss, a SPACEHAB module and external stowage platform 3. STS-118 is targeted for launch on Aug. 7. Photo credit: NASA/George Shelton