Merced Army Air Field auxiliary fields were built to support pilot training at the Merced Army Air Field. In 1940 the US Army wanted to built near Merced, California a 30,000 per year basic pilot training base. The former city of near the Atchison, Topeka and Santa Fe Railway rail line was chosen at 37°22′50″N 120°34′05″W / 37.38056°N 120.56806°W at an elevation of 181 feet (55 m) for the main base, in Atwater, California. United States Army Air Corps leased the land from the City of Merced on 16 June 1941. Building the airbase school started on 8 July 1941 and opened on 20 September 1941 as a sub base of Army Air Forces Western Flying Training Command at Moffett Field. First called Air Corps Basic Flying School, Merced. The US Army moved part of the: 98th Bombardment Group, 539th Schoo