Stock Photo - NASA astronauts Doug Hurley (left), STS-135 pilot; and Rex Walheim, mission specialist, participate in a food tasting session in the Habitability and Environmental Factors Office at NASA's Johnson Space Center. STS-135 is planned to be the final mission of the space shuttle program.

Stock Photo: NASA astronauts Doug Hurley (left), STS-135 pilot; and Rex Walheim, mission specialist, participate in a food tasting session in the Habitability and.

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