George Zamka practices driving the armored personnel carrier part of emergency exit procedures from Launch Pad 39A.

STS-120 Pilot George Zamka practices driving the M-113 armored personnel carrier, part of emergency exit procedures from Launch Pad 39A. Alongside is the trainer. In the rear of the M-113 are Mission Specialists Daniel Tani, Commander Pamela Melroy and Mission Specialists Stephanie Wilson, Paolo Nespoli and Doug Wheelock. Nespoli represents the European Space Agency. The training is part of terminal countdown demonstration test, or TCDT, activities the crew is undertaking at NASA's Kennedy Space Center. The TCDT also includes equipment familiarization and a simulated launch countdown. Mission STS-120, which will carry the Italian-built U.S. Node 2 to the International Space Station, is targeted for launch on Oct. 23. Photo credit: NASA/Kim Shiflett