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JSC2010-E-196881 (20 Dec. 2010) --- NASA astronaut Rex Walheim, STS-135 mission specialist, dons a training version of his shuttle launch and entry suit in preparation for a training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center. United Space Alliance suit technician Joel Alvarado 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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