Memphis Belle is the nickname of a Boeing B-17F Flying Fortress during the Second World War that inspired the making of two motion pictures. The aircraft was one of the first B-17 United States Army Air Forces heavy bombers to complete 25 combat missions with her crew intact. The Boeing B-17 Flying Fortress is a four-engine heavy bomber aircraft developed in the 1930s for the United States Army Air Corps (USAAC). The B-17 was primarily employed by the United States Army Air Forces (USAAF) in the daylight precision strategic bombing campaign of WWII against German industrial and military targets. The United States Eighth Air Force, based at many airfields in southern England, and the Fifteenth Air Force, based in Italy, complemented the RAF Bomber Command's nighttime area bombing in the Combined Bomber Offensive to help secure air superiority over the cities, factories and battlefields of Western Europe in preparation for the invasion of France in 1944. The B-17 also participated to a lesser extent in the War in the Pacific, early in WWII, where it conducted raids against Japanese shipping and airfields.