Kingsley

George O'Brien

Anna Marie Von Steuben

Marion Lessing

Fraulein Lolita

Mona Maris

'Lug' Kaufman

Warren Hymer

Mugs O'Flaherty (uncredited)

William Collier Sr.

Chief Mike 'Guns' Costello

Walter C. Kelly

Chief Joe Cobb

Walter McGrail

Franz Shiller

John Loder

Ens. Richard 'Dick' Cabot (as Gaylord Pendleton)

Steve Pendleton

Lt. "Mac" McGregor

Larry Kent

'Butch' Wagner (uncredited)

Nat Pendleton

Baron Ernst von Steuben

Henry Victor

Adolph Brucker

Ferdinand Schumann-Heink

German Chief Petty Officer (uncredited)

Philip Ahlm

Winkler (uncredited)

Harry Tenbrook

Reilly

Terrance Ray

Fritz Kampf

Hans Furberg

Trawler Captain

Francis Ford

Naval Reservist (uncredited)

Joseph Depew

Hoffman (uncredited)

Curt Furberg

Harrigan

Ben Hall

Naval Reservist (uncredited)

Robert Ford

Fritz Kampf (Second Officer of U-172) (uncredited)

Hans Fuerberg

Levinsky (uncredited)

Harry Weil

Merkel (uncredited)

Maurice Murphy

Naval Reservist (uncredited)

George Golden

Naval Reservist/Swimmer and Diver (uncredited)

George Harris

Naval Reservist (uncredited)

Bob Kyle

Naval Reservist (uncredited)

Jack Murphy

Naval Reservist (uncredited)

Edward Peil Jr.

Gunner (uncredited)

Marvin Schecter

German Officer (uncredited)

Harry Schultz

Gunner and drill sergeant (uncredited)

Harry Strang

Naval Reservist (uncredited)

George Templeton