Crew members signal their pleasure in participating in M-113 driving practice part of emergency exit procedures from Launch Pad 39A.

STS-120 crew members signal their pleasure in participating in M-113 driving practice, part of emergency exit procedures from Launch Pad 39A. Seen here on the M-113 are Mission Specialists Scott Parazynski, Stephanie Wilson, Daniel Tani, 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