On Launch Pad 39A STS 118 Mission Specialist Tracy Caldwell makes her way to the White Room.

On Launch Pad 39A, STS-118 Mission Specialist Tracy Caldwell makes her way to the White Room. There she will have her launch and entry suit prepared for liftoff by the closeout crew. Caldwell and the rest of the crew are taking part n a simulated launch countdown, the culmination of terminal countdown demonstration test activities. The White Room is situated at the end of the orbiter access arm and provides entry into the orbiter. TCDT activities 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/Amanda Diller