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KENNEDY SPACE CENTER, FLA. - Inside the Orbiter Processing Facility bay 3 at NASA's Kennedy Space Center, STS-121 Mission Specialist Lisa Nowak photographs Discovery, the launch vehicle for the mission, during a training session. She and other crew members -- Commander Steven Lindsey, Pilot Mark Kelly and Mission Specialists Stephanie Wilson, Michael Fossum and Piers Sellers -- are at Kennedy for a crew equipment interface test, which provides hands-on experience with equipment they will use on orbit. Launch of STS-121, the second return-to-flight mission, is scheduled for no earlier than May. Photo credit: NASA/Kim Shiflett