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July 18, 2012
JSC2011-E-059409 (17 May 2011) --- NASA astronaut Rex Walheim, STS-135 mission specialist, watches as the space shuttle Atlantis is moved from the Orbiter Processing Facility to the Vehicle Assembly Building at NASA's Kennedy Space Center on May 17, 2011. The move, known as rollover, is a milestone in the preparation for launch as the orbiter leaves its processing hangar to be prepped for its final flight. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool

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