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September 5, 2012
JSC2010-E-195521 (3 Dec. 2010) --- NASA astronaut Rex Walheim (left), STS-135 mission specialist, participates in an emergency egress training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center. Crew instructor Patrick Jones assisted Walheim. STS-135 is planned to be the final mission of the space shuttle program. Photo credit: NASA or National Aeronautics and Space Administration


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