The crew arrives to take part in the Terminal Countdown Demonstration Test TCDT a dress rehearsal for launch.

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 Specialists Alvin Drew; Barbara R. Morgan; Dave Williams, representing the Canadian Space Agency; Rick Mastracchio; Tracy Caldwell; Pilot Charlie Hobaugh and Commander Scott Kelly. 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/George Shelton