Sal Mineo

as Luigi J. Maresi

Christine Carère

as Marie

Barry Coe

as Jerry Morgan

Barbara Eden

as Sgt. Katie Mulligan

Gary Crosby

as Mike Conroy

Terry Moore

as Louise Wright

Jim Backus

as Jim Gordon

Jessie Royce Landis

as Elizabeth T. Chapman

Robert Burton

as Gen. Charles E. Hargrave

Alan Hewitt

as Maj. R.C. Hanley

Bob Denver

as MacIntosh

Tige Andrews

as Sgt. Pickerell

Ray Montgomery

as Capt. Hickman

Rudolph Anders

as Dr. Leyden

Debbie Joyce

as Magdalena

Bess Flowers

as Surgeon General's Wife

Paul Comi

as Military Policeman

Miranda Jones

as Secretary