William Hall
— Capt. Todd Hayden
Jane Wyman
— Elaine Burdette
Esther Ralston
— Jean Bruce (as Jane Carleton)
Robert Warwick
— Col. Burdette
Leon Ames
— Frank Denton
Ben Alexander
— Capt. Don Mayhew
Don Barclay
— Private Timothy O'Reilly
Egon Brecher
— General A. R. Bowen
Paul Sutton
— Charley (Spy-Ring Chauffeur)
Jack Mulhall
— Capt. Tex Randolph
LeRoy Mason
— Paul Douglas
Harry Woods
— Capt. Holden
Phillip Trent
— Capt. Robert Scott
Lester Dorr
— Firing Range Radio Operator (uncredited)
Pat Gleason
— Reporter (uncredited)
Eddie Gribbon
— Sergeant Who Threatens Mayhew (uncredited)
Harry Harvey
— Reporter (uncredited)
Carlyle Moore Jr.
— Cavalry Officer Playing Polo (uncredited)
Eddie Parker
— Reporter (uncredited)
John Ridgely
— Spy Ring Member (uncredited)
Frances Robinson
— Girl at Officer's Club Dinner (uncredited)
Carl Stockdale
— Firing Range Officer (uncredited)
Glenn Strange
— The 'Champ' (uncredited)
Forrest Taylor
— G-2 Sergeant (uncredited)
Carleton Young
— Polo Game Timekeeper (uncredited)