- James Cagney as Private Jerry Plunkett
- Pat O'Brien as Father Francis P. Duffy
- George Brent as Major "Wild Bill" Donovan
- Jeffrey Lynn as Sergeant Joyce Kilmer
- Alan Hale, Sr. as Sergeant "Big Mike" Wynn
- Frank McHugh as Terence "Crepe-Hanger" Burke
- Dennis Morgan as Lieutenant Oliver Ames
- Dick Foran as Lieutenant "Long John" Wynn
- William Lundigan as Private Timothy "Timmy" Wynn
- Guinn Williams as Paddy Dolan
- Henry O'Neill as The Colonel
- John Litel as Captain Mangan
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- Sammy Cohen as Mike Murphy (Mischa Moskowitz)
- Harvey Stephens as Major Alex Anderson
- William Hopper as Private Turner
- Tom Dugan as Private McManus
- Frank Wilcox as Lieutenant John Norman
- George Reeves as Jack O'Keefe
- Frank Coghlan, Jr. as Jimmy
- Herbert Anderson as Casey
- Jack Boyle, Jr. as Chuck
- Richard Clayton as Tierney
- John Daheim as a soldier
- Eddie Dew as Regan
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