Flying students Danny Collins (Johnny Downs), "Jinx" Roberts (Bobby Jordan), "Scrapper" McKay (Ward Wood) and "Zombie" Parker (William Benedict) are suspected of a series of murders perpetrated by engineer, Arthur Galt (Robert Armstrong) operating as a Nazi agent known as the Black Hangman. He has disposed of several people who accompanied him on an expedition which located lost helium deposits in Africa.
Policeman Jon Davis (Richard Arlen) informs "Foxy" Pattis (Chester Morris) at his shooting gallery, that his criminal father has died. Foxy blames all policemen, feeling they harassed him all his life and were responsible for his death. Both men enlist in the United States Army Air Forces where Foxy becomes the instructor at an aerial gunnery school. He makes life miserable for Jon, now a "Flying Sergeant" student, trying to force the former policeman to resign.
On December 6, 1941, at Hamilton Field, near San Francisco, a United States Army Air Corps B-17D bomber Mary-Ann and its crew are being readied for a flight across the Pacific.
En 1943, en préparation d’un déploiement à l’étranger, 400 pilotes et 3600 hommes d’équipage du 351 groupe bombardier se rassemblent sur une base aérienne du Colorado. A leur arrivée en Angleterre, ils sont accueillis par la Royal Air Force et commencent leur entrainement, notamment en assistant à des conférences sur la sécurité. Leur première mission nécessite un décollage à 15 secondes d’intervalle.
Jugée trop « compatissante » envers les japonais, et coupée au montage par l’État-Major américain, cette reconstitution hautement réaliste reçut néanmoins l’Oscar® du meilleur documentaire en 1943.
In 1943 retired Navy Chief Bosun's Mate Steve "Boley" Boleslavski (Edward G. Robinson) helps build the destroyer John Paul Jones, the namesake of the ship he served on in World War I, sunk a quarter century later while saving an aircraft carrier from being torpedoed. When he finds out that an old shipmate, Lieutenant Commander Clark (Regis Toomey), is the ship's new captain, he returns to the Navy and wrangles a berth as the ship's leading chief bosun's mate.
Most of the film is taken up with a short play in which a young pilot, portrayed by Ronald Reagan, is ordered on reconnaissance missions of the Pacific and encounters another plane which he can't tell is friendly or not. This plot is interspersed with animated segments illustrating the physical characteristics of the Japanese Zero and how it can be distinguished from an American plane.
The plot of the film revolves around the life of seamen on board an anonymous aircraft carrier. Because of war time restrictions, the name of the aircraft carrier was disguised as "the Fighting Lady", although she was later identified as USS Yorktown. A few shots of aircraft landing were filmed aboard the Yorktown's sister ship USS Ticonderoga.
The movie centers around efforts by German intelligence to find the target of an upcoming raid by the mythical "B-99 bomber." To achieve this end, they interrogate a recently shot-down air crew.