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KENNEDY SPACE CENTER, FLA. -- The STS-120 crew is at NASA's Kennedy Space Center for the pre-launch terminal countdown demonstration test, or TCDT. Here, during emergency egress training, crew members practice climbing into the slidewire baskets that can carry them safely to a landing site away from the shuttle. In the basket are, from left, Mission Specialists Doug Wheelock and Scott Parazynski and Pilot George Zamka. Watching them are, from left, Commander Pamela Melroy and Mission Specialists Stephanie Wilson and Daniel Tani, with camera. After the mission, Tani will remain aboard the International Space Station and return with the STS-122 crew, targeted to launch Dec. 6. The TCDT provides astronauts and ground crews an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. The STS-120 mission will deliver the U.S. Node 2 module, named Harmony, aboard space shuttle Discovery to the International Space Station. Launch of Discovery on mission STS-120 is targeted for Oct. 23 at 11:38 a.m. EDT on a 14-day mission. Photo credit: NASA/Kim Shiflett