Redstone Army Airfield or Redstone AAF (IATA: HUA, ICAO: KHUA, FAA LID: HUA) is a military airport located at Redstone Arsenal, six miles (10 km) southwest of the city of Huntsville in Madison County, Alabama, United States. The airfield was originally constructed for munitions testing for the U.S. Army and the U.S. Army Air Forces through the 6th AAF Base Unit (Proving Ground Detachment). It is currently used to support the U.S. Army Aviation and Missile Command, NASA, and other U.S. government aviation and space activities.