The Boeing B-17 Flying Fortress became the signature US heavy bomber of the Second World War, and this film traces how it got there. It starts with the aircraft's ancestors, the Martin B-10 and Douglas B-18, before covering Boeing's private-venture Model 299, the prototype that grew into the production B-17. Archival footage covers the design choices that made the plane famous: its heavy defensive armament, meant to let bomber formations fight through enemy fighters without escort, and the rugged airframe construction that let damaged aircraft limp home. The film moves through the type's combat record, including bombing runs over occupied Europe, using period film alongside explanation of the strategic bombing doctrine the aircraft was built to serve. It is a straightforward production history rather than a single-mission narrative, weighing the B-17 against the bombers that came before it and the strategic thinking that shaped its design. The archival material, some of it rarely seen, is the strongest reason to watch.