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KENNEDY SPACE CENTER, Fla. -- The STS-118 crew arrives at Kennedy's Shuttle Landing Facility aboard a Shuttle Training Aircraft to take part in the Terminal Countdown Demonstration Test (TCDT), a dress rehearsal for launch. From left are Mission Specialist Barbara R. Morgan, Commander Scott Kelly and Mission Specialist Alvin Drew. Morgan joined NASA's Teacher in Space program in 1985 and was selected as an astronaut in 1998. TCDT activities include M-113 armored personnel carrier training, payload familiarization, emergency egress training at the pad and a simulated launch countdown. The STS-118 payload aboard Space Shuttle Endeavour includes the S5 truss, a SPACEHAB module and external stowage platform 3. The mission is the 22nd flight to the International Space Station and is targeted for launch on Aug.7. Photo credit: NASA/Ken Thornsley