Robert Louis Bob Behnken (born July 28 1970 in Creve Coeur Missouri) is a United States Air Force officer and a NASA astronaut. Behnken holds a Ph.D in Mechanical Engineering and has reached the rank of Colonel in the U.S. Air Force. Bob Behnken has logged over 1000 flight hours in 25 different aircraft. He flew on Space Shuttle mission STS-123 as a Mission Specialist. Bob Behnken has accumulated over 378 hours in space including 19 hours of spacewalk time.
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