an air base on the East Mesa in 1939. World War II As of late 1939, Army and Navy pilots began using Oxnard Field for refueling and maintenance for a variety of military flights. Later that same year, the Army Air Corps leased 2,000 acres neighboring Albuquerque Airport, four miles west of Oxnard Field. The Army eventually condemned the Oxnard Field property for military use, with subsequent transfer to the federal government. Construction of Albuquerque Army Air Base began in January 1941 and was completed in August 1941. Albuquerque Army Air Base received its first military aircraft in March, and on 1 April 1941, a lone B-18 bomber, landed on the north–south runway. With the assignment of five pilots to the aircraft, the day marked the official opening of Albuquerque Army Air Base. The first buildings on the installation were simple wood-frame structures constructed quickly in order to fulfill the country's urgent need for trained pilots to fight the war. Most of the buildings were Theater of Operations construction while some were of the Mobilization type. The Mobilization type buildings included the station hospital, theater, chapel, and Link training buildings. During World War II there were three levels of pilot training: Primary Flying School Basic Flying School Advanced Flying School (including Transition Training) The Albuquerque Army Air Base provided advanced flying training in "AT" (advanced trainer) trainer aircraft and transition training in combat-ready aircraft, primarily the B-17 Flying Fortress and the B-24 Liberator. In addition to pilot training, the Albuquerque Army Air Base provided bombardier training at its Advanced Flying School. During this period, the facility was under the Flying Training Command and the Air Training Command. In addition to the main airfield, several auxiliary airfields were used to support the flying school: Oxnard Airport (Original Albuquerque Airport) West Mesa Airport Acomita CAA Intermediate Airfield Paddy Auxiliary Army Airfield Santa Fe Auxiliary Army Airfield Socorro Auxiliary Army Airfield 19th Bombardment Group The 19th Bombardment Group arrived at Albuquerque AAB from March Field, California, in April 1941, shortly after the base was activated. Its purpose was to train air and ground crews for reconnaissance and bombing duty on Boeing B-17 "Flying Fortresses" before deployment to Clark Field in the Philippine Islands. The 19th Bombardment Group became the most famous bomber unit of World War II for its part in the strategic campaign against Japan. The 30th, 32nd, and 93rd Bombardment Squadrons