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KENNEDY SPACE CENTER, FLA. - Inside the Orbiter Processing Facility bay 3 at NASA's Kennedy Space Center, members of the STS-121 crew take a close look at Discovery, the launch vehicle for the mission. Seen are Mission Specialist Stephanie Wilson and Pilot Mark Kelly. The crew is at Kennedy for the 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