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September 5, 2012
JSC2010-E-193959 (2 Dec. 2010) --- NASA astronaut Rex Walheim, STS-135 mission specialist, participates in a training session in the fixed-base shuttle mission simulator (SMS) in the Jake Garn Simulation and Training Facility at NASA's Johnson Space Center. STS-135 is planned to be the final mission of the space shuttle program. Photo credit: NASA or National Aeronautics and Space Administration