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KENNEDY SPACE CENTER, FLA. -- A worker on a stand behind the mobile launcher platform holding Space Shuttle Discovery waits for first motion of the shuttle out of NASA's Vehicle Assembly Building. The rollout is an important step before launch of Discovery on mission STS-121 to the International Space Station. Discovery's launch is targeted for July 1 in a launch window that extends to July 19. During the 12-day mission, Discovery's crew will test new hardware and techniques to improve shuttle safety, as well as deliver supplies and make repairs to the station. Photo credit: NASA/Jack Pfaller