Phillips Army Air Field (IATA: APG, ICAO: KAPG) is a United States Army airfield located at Aberdeen Proving Ground in Aberdeen, Harford County, Maryland. It serves as the primary aviation facility for Aberdeen Proving Ground, one of the oldest active military installations in the United States. The airfield primarily supports military operations, testing, and logistics for Aberdeen Proving Ground, which is a major center for U.S. Army research, development, and testing of weapons systems and equipment. The facility is not open to commercial passenger traffic and operates under military jurisdiction. The airport sits near the northern end of the Chesapeake Bay and is within approximately 30 miles of Baltimore, Maryland. Its IATA code APG is assigned for logistical and identification purposes rather than commercial aviation use.