Douglas Harry "Wheels" Wheelock (born May 5, 1960) is an American engineer and astronaut. He has flown in space twice, logging 178 days on the Space Shuttle, International Space Station, and Russian Soyuz. On July 12, 2011, Wheelock announced that he would be returning to active duty with the United States Army in support of Operation Enduring Freedom. He is currently working with NASA to test the Orion spacecraft at the Glenn Research Center in Plum Brook, Ohio.