NASA astronaut Rex Walheim (foreground), STS-135 mission specialist, undergoes a fit check of his Sokol spacesuit March 28, 2011 at the Zvezda facility in Moscow. The crew of the final shuttle mission traveled to Moscow for a suit fit check of their Russian Sokol suits that will be required in the event of an emergency.

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NASA astronaut Rex Walheim (foreground), STS-135 mission specialist, undergoes a fit check of his Sokol spacesuit March 28, 2011 at the Zvezda facility in Moscow. The crew of the final shuttle mission traveled to Moscow for a suit fit check of their Russian Sokol suits that will be required in the event of an emergency.

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