The 447th Bombardment Group was activated at Geiger Field, Washington on 1 July 1943 with the 748th, 749th, 750th and 751st Bombardment Squadrons assigned. It moved a week later to Rapid City Army Air Base, South Dakota, where it began training with the Boeing B-17 Flying Fortress heavy bomber and completed the first two phases of its training there. It completed its training at Ephrata Army Air Base, Washington, then moved to Wendover Field, Utah for final preparation for overseas movement. It departed for the European Theater of Operations on New Years Day, 1944.