During emergency egress training at the pad, STS-121 crew members Piers Sellers, Stephanie Wilson and Thomas Reiter, all mission specialists, learn how to exit the slidewire basket on the ground. The crew is at Kennedy for Terminal Countdown Demonstration Test activities, including emergency egress training from the pad. They will also suit up in their orange flight suits for a simulated countdown to launch. Discovery is designated to launch July 1 on mission STS-121. It will carry supplies to the International Space Station. Photo credit: NASA/Kim Shiflett