Rex J. WalheimStatus: Retired 10/10/1962 – Nationality: American Type: Government First Flight: 4/8/2002 Last Flight: 7/8/2011Rex Joseph Walheim is a retired United States Air Force officer, engineer and NASA astronaut. He flew three space shuttle missions, STS-110, STS-122, and STS-135. Walheim 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.LaunchesSpace Shuttle Atlantis / OV-104 | STS-110Space Shuttle Atlantis / OV-104 | STS-122Space Shuttle Atlantis / OV-104 | STS-135National Aeronautics and Space AdministrationType: Government Abbreviation: NASA Administration: Administrator: Jim Bridenstine Founded: 1958 Launchers: Space Shuttle | SLS Spacecraft: Orion Country: USAThe National Aeronautics and Space Administration is an independent agency of the executive branch of the United States federal government responsible for the civilian space program, as well as aeronautics and aerospace research. NASA have many launch facilities but most are inactive. The most commonly used pad will be LC-39B at Kennedy Space Center in Florida.