Mariposa Auxiliary Field was an 62.194 acre auxiliary airfield of the Merced Army Air Field used for World War 2 pilot training. Mariposa Auxiliary Field was located four miles northwest of the city of Mariposa, in Mariposa County, California at at an elevation of 2,254 feet. After the war the airfield became the current Mariposa-Yosemite Airport. The War Department leased the 1937 Mariposa County Airport on 60.442 acres of valley land from the County of Mariposa in 1942. To enlarge the base 0.364 acres were leased from John Marre and an additional 1.388 leased from Richard Morrissey. The Army built a radio beacon nearby on Mount Bullion owned by the Bureau of Land Management in the 1940s. For training the Army used the existing: 3,306 foot runway, hangar, gasoline fueling equipment, lighting, and cabin. The airfield also served as an emergency landing field. At an elevation of 2,254 feet the airfield was above the common San Joaquin valley fog layer, making at a good training and emergency landings. Pilots used the airfield for takeoff and landing training. In 1945 the lease was ended and land returned to it owners. The airfield has also been called the Mount Bullion Airport, the Mariposa County Airport and it current name Mariposa Yosemite Airport. militarymuseum.org Mariposa Auxiliary Field
