For the former sports venue in Tampa, Florida see Phillips Field. Phillips Army Airfield is a military airport located at Aberdeen Proving Ground, in Harford County, Maryland, United States. This U.S. Army airfield has three asphalt paved runways: 4/22 is 7,997 by 200 feet (2,437 x 61 m), 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).