 In March 1944, the 225th Army Air Force Base Unit switched from training entire units to training individual replacement personnel to send to units deployed overseas.The field's instructors taught thousands of pilots, navigators, radio operators and gunners from nine heavy bombardment groups and numerous smaller units.On 15 July 1945, the 225th AAFBU was inactivated and Rapid City AAB was placed on standby status as the Army Air Forces began to demobilize.