- William Hall
- Capt. Todd Hayden
- Jane Wyman
- Elaine Burdette
- Esther Ralston
- Jean Bruce
- 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
- Pat Gleason
- Reporter
- Eddie Gribbon
- Sergeant Who Threatens Mayhew
- Harry Harvey
- Reporter
- Carlyle Moore Jr.
- Cavalry Officer Playing Polo
- Eddie Parker
- Reporter
- John Ridgely
- Spy Ring Member
- Frances Robinson
- Girl at Officer's Club Dinner
- Carl Stockdale
- Firing Range Officer
- Glenn Strange
- The 'Champ'
- Forrest Taylor
- G-2 Sergeant
- Carleton Young
- Polo Game Timekeeper
