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KENNEDY SPACE CENTER, FLA. - In NASA Kennedy Space Center's Orbiter Processing Facility bay 3, members of the STS-121 crew practice working with equipment for the mission. Starting from left are Tomas Gonzalez-Torres, with NASA's Johnson Space Center; Mission Specialist Stephanie Wilson, Pilot Mark Kelly, and Mission Specialists Piers Sellers and Michael Fossum. The crew is at Kennedy to take part in the crew equipment interface test, which provides hands-on experience with equipment to be used on-orbit. Launch of Space Shuttle Discovery on mission STS-121, the second return-to-flight mission, is scheduled no earlier than May.