An early Boeing B-17 Flying Fortress, marked '80,' sits on a grass airfield in this prewar U.S. Army Air Corps photograph. Distinguished by its framed nose glazing, small tail fin, and unarmored profile, the aircraft represents one of the B-17's earliest production variants - the B, C, or D series - flown in the years immediately before America's entry into World War II. These early Fortresses helped establish the doctrine of high-altitude daylight strategic bombing that would later define the Eighth Air Force's campaign over Europe. Project: 218218