Phillips Army Airfield (IATA: APG, ICAO: KAPG, FAA LID: APG) is a military airport located at Aberdeen Proving Ground, in Harford County, Maryland, United States. This U.S. Army airfield has one asphalt paved runway: 4/22 is 7,997 by 200 feet (2,437 x 61 m) in service and two runways, 8/26 is 4,849 by 149 feet (1,478 x 45 m) and 17/35 is 5,004 by 149 feet (1,525 x 45 m), no longer in service.