The United States Air Force's 457th Air Expeditionary Group is a provisional United States Air Force unit assigned to United States Air Forces in Europe to activate or inactivate as needed. It has been activated to support Operation Iraqi Freedom, joint operations with the Tanzania Air Force Command and for Operation Odyssey Dawn. The group was activated during World War II as the 457th Bombardment Group. It flew Boeing B-17 Flying Fortress from England, entering the strategic bombing campaign during Big Week. It flew 7,086 sorties before returning to the United States for inactivation in the summer of 1945. It was again active from 1993 to 1994 as the 457th Operations Group, controlling Air Mobility Command's air refueling operations at Altus Air Force Base, Oklahoma. The 457th was converted to provisional status in 2001. History World War II Training in the United States The 457th 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. Combat in Europe The group assembled at its combat station, RAF Glatton by the end of the month. The air echelon had begun arriving at Glatton on 21 January. The group flew its first mission during Big Week on 21 February 1944, as Eighth Air Force concentrated its attacks on Germany's aircraft manufacturing industry. It engaged primarily in the strategic bombing campaign against Germany, attacking ball bearing plants, oil refineries and aircraft factories until June 1944. In July 1944, the group returned to strategic targets, which remained its primary objectives through April 1945. On 2 November 1944, the 457th and another group strayed from the main bomber stream and its fighter cover. Luftwaffe fighter controllers directed a geschwader of interceptors against the formation. Nine of the 457th Group's Flying Fortresses were lost to this attack. In June 1944, the group was diverted from its strategic mission to prepare for Operation Overlord, the invasion of France. On D Day, it attacked coastal defenses on