Rex Joseph Walheim (born October 10 1962) is a United States Air Force officer and a NASA astronaut. He has flown three space shuttle missions STS-110 STS-122 and STS-135. Rex has logged over 566 hours in space including 36 hours and 23 minutes of spacewalk (EVA) time. He was assigned as mission specialist and flight engineer on STS-135 the final space shuttle mission.
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