The STS-135 crew practices rendezvous and docking with the International Space Station in the Systems Engineering Simulator at the Johnson Space Center at the Johnson Space Center on Tuesday, June 28, 2011, in Houston. Commander Chris Ferguson is at back left, mission specialist Rex Walheim is at back right. Pilot Doug Hurley is at center. The session marked the crew's final scheduled training in the 'Dome' in preparation for the final mission of the space shuttle program. ( Smiley N. Pool / Houston Chronicle ) Ozzythewise AstronautsJSC 260212

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