An armored personnel carrier pushes through the underbrush during driving practice by the STS-120 crew.

An M-113 armored personnel carrier pushes through the underbrush during driving practice by the STS-120 crew. In the driver's seat, at right, is Mission Specialist Doug Wheelock. In the center is the trainer. Other crew members in the rear are (left to right) Mission Specialists Daniel Tani, Scott Parazynski and Paolo Nespoli and Pilot George Zamka. 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