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KENNEDY SPACE CENTER, FLA. -- Space Shuttle Discovery sits on launch Pad 39B, waiting for the rotating service structure to be moved into place for final launch preparations. At the top left of the photo is the end of the hammerhead crane, on the fixed service structure, that provides hoisting services required in pad operations. Liftoff of Discovery on mission STS-96 is targeted for May 20 at 9:32 a.m. EDT. STS-96 is a logistics and resupply mission for the International Space Station, carrying such payloads as a Russian crane, the Strela; a U.S.-built crane; the Spacehab Oceaneering Space System Box (SHOSS), a logistics items carrier; and STARSHINE, a student-led experiment