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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. During emergency egress training, the crew gets instructions about what to do when the slidewire baskets (at right) reach the landing site. In the foreground is Commander Pamela Melroy; lined up behind her are Pilot George Zamka and Mission Specialists Daniel Tani, Scott Parazynski, Stephanie Wilson, Doug Wheelock and Paolo Nespoli, who represents the European Space Agency. 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