B-17 Fortezza volante Modello 3D

The B-17 Flying Fortress is a four-engined heavy bomber developed in the 1930s for the United States Army Air Corps . From its introduction in 1938, the B-17 Flying Fortress evolved through numerous design advances,becoming the third-most produced bomber of all time, behind the four-engined B-24 and the multirole, twin-engined Ju 88. The B-17 was primarily employed by the USAAF in the daylight strategic bombing campaign of World War II against German industrial and military targets. The United States Eighth Air Force, based at many airfields in central, eastern and 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 World War II, where it conducted raids against Japanese shipping and airfields.