The airport was originally built in 1942 by the United States Army Air Forces as a training base for Air Corps Flying Training Command. Gulfport Army Airfield opened on July 7, and the Eastern Technical Training Command conducted technical training and basic training unit transferred to Third Air Force on March 31, 1944 with joint use by Technical Training Command for marine training of Emergency Rescue School (3d Air Rescue Group) at Keesler Army Airfield. With the end of the war and the drawdown of the military, Gulfport AAF was placed into reserve status on January 31, 1946.