During emergency egress training pose for a photo on the upper level in front of Space Shuttle Discovery's external tank.

During emergency egress training at the pad, the STS-121 crew pose for a photo on the upper level in front of Space Shuttle Discovery's external tank. From left are Mission Specialists Piers Sellers, Thomas Reiter and Lisa Nowak, Commander Steven Lindsey, Mission Specialist Stephanie Wilson, Pilot Mark Kelly and Mission Specialist Michael Fossum. 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