Buster Keaton as Elmer J. Stuyvesant, Jr.

Sally Eilers as Mary

Cliff Edwards as Nescopeck

Edward Brophy as Sgt. Brophy

Victor Potel as Svendenburg

Arnold Korff as Gustave

Frank Mayo as Capt. Scott

Pitzy Katz as Abie Cohn

William Steele as Lt. Randolph

Bobby Barber as Doughboy (uncredited)

Sidney Bracey as Recruiter (uncredited)

John Carroll as Doughboy in Elmer's Squad (uncredited)

Jack Cheatham as Guard House Sentry (uncredited)

Jimmie Dundee as Riveter (uncredited)

Joseph W. Girard as General Hull (uncredited)

Pat Harmon as Induction Non-Com (uncredited)

Tiny Sandford as Bit (uncredited)

Edward Sedgwick as Guggleheimer the Camp Cook (uncredited)

Harry Strang as Induction Officer (uncredited)

Harry Stubbs as Sergeant (uncredited)