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KENNEDY SPACE CENTER, FLA. - After their arrival at NASA's Kennedy Space Center, the STS-121 crew poses for a photo. From left are Mission Specialist Michael Fossum, Pilot Mark Kelly, Mission Specialist Lisa Nowak, Commander Steven Lindsey and Mission Specialists Stephanie Wilson, Piers Sellers and Thomas Reiter from Germany, who represents the European Space Agency. The crew is at the space center to take part in a Terminal Countdown Demonstration Test, or TCDT. Over several days, the crew will practice emergency egress from the pad and suit up in their orange flight suits for the simulated countdown to launch. Space Shuttle 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