Two American-army officers are working on a new type of machine-gun for anti-aircraft warfare, when one of them is murdered. The other vows to get the spies that are after the invention and avenge his friend's death.
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William Hall as Capt. Todd Hayden
Jane Wyman as Elaine Burdette
Esther Ralston as Jean Bruce (as Jane Carleton)
Robert Warwick as Col. Burdette
Leon Ames as Frank Denton
Ben Alexander as Capt. Don Mayhew
Don Barclay as Private Timothy O'Reilly
Egon Brecher as General A. R. Bowen
Paul Sutton as Charley (Spy-Ring Chauffeur)
Jack Mulhall as Capt. Tex Randolph
LeRoy Mason as Paul Douglas
Harry Woods as Capt. Holden
Phillip Trent as Capt. Robert Scott
Lester Dorr as Firing Range Radio Operator (uncredited)
Pat Gleason as Reporter (uncredited)
Eddie Gribbon as Sergeant Who Threatens Mayhew (uncredited)
Harry Harvey as Reporter (uncredited)
Carlyle Moore Jr. as Cavalry Officer Playing Polo (uncredited)
Eddie Parker as Reporter (uncredited)
John Ridgely as Spy Ring Member (uncredited)
Frances Robinson as Girl at Officer's Club Dinner (uncredited)
Carl Stockdale as Firing Range Officer (uncredited)
Glenn Strange as The 'Champ' (uncredited)
Forrest Taylor as G-2 Sergeant (uncredited)
Carleton Young as Polo Game Timekeeper (uncredited)