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)