Stock Photo - NASA astronaut Rex Walheim, STS-135 mission specialist, participates in an EVA Thermal Protection System (TPS) overview training session in the TPSPrecision Air Bearing Facility in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.

Stock Photo: NASA astronaut Rex Walheim, STS-135 mission specialist, participates in an EVA Thermal Protection System (TPS) overview training session in the TPSPrecision Air.

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