Robert Gray Army Airfield (IATA: GRK, ICAO: KGRK, FAA LID: GRK) is a military joint-use airport that operates alongside Killeen–Fort Hood Regional Airport. The airport is based inside the south end of the Fort Hood Military Reservation (West Fort Hood), six nautical miles (7 mi, 11 km) southwest of the central business district of Killeen, Texas, in unincorporated Bell County.