Charlie Hobaugh practices driving an M-113 armored personnel carrier with Tracy Caldwell mission specialist.

STS-118 Pilot Charlie Hobaugh practices driving an M-113 armored personnel carrier with passenger (at left) Tracy Caldwell, mission specialist. They and other crew members are at Kennedy for the Terminal Countdown Demonstration Test (TCDT), a dress rehearsal for launch. TCDT activities include the M-113 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. NASA/George Shelton