Stock Photo - NASA astronaut Rex Walheim (foreground), STS-135 mission specialist, participates in an extravehicular activity (EVA) hardware training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. EVA instructor Art Thomason assisted Walheim. STS-135 is planned to be the final mission of the space shuttle program.

Stock Photo: NASA astronaut Rex Walheim (foreground), STS-135 mission specialist, participates in an extravehicular activity (EVA) hardware training session in the Neutral.

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