Victorville Army Airfield auxiliary fields were four airfields used during World War II to support the Victorville Army Airfield pilot training near Victorville, California, and Adelanto, California. After the war the Victorville Army Airfield was renamed George Air Force Base on January 13, 1948. The airfields were built in 1941 by the United States Army Air Corps just before the war. Victorville Army Airfield covered 2,200-acre in the Mojave Desert. The US Army held a groundbreaking ceremony on 12 July 1941. The base, called Victorville Army Flying School, was ready to use before the attack on Pearl Harbor on December 7, 1941. The Army built four runways in a triangle configuration, with one runway down the middle of the triangle. Seven hangars were built to support operation. On April 23, 1943, the base was renamed Victorville Army Airfield.