Maj. Bernard R. 'Barney' Benson

Charlton Heston

Dr. Kay Lambert

Julie Adams

John

William Demarest

Cadet Lt. Gerald Hibler

Tim Considine

Cadet Thomas 'Tiger' Flaherty

Tim Hovey

Cadet Col. Sylvester Dusik

Sal Mineo

Mother Redempta

Nana Bryant

Mrs. Flaherty

Kay Stewart

Maj. Gen. Wilton J. Ramsey

Milburn Stone

Sister Mary Theresa

Mary Field

Cadet Cpl. Scawalski

Donald Keeler

Harold Hibler

Don Haggerty

Cadet Lt. Molony

Gary Pagett

Mrs. Hibler

Yvonne Peattie

Sister Mary Thomasina

Mary Alan Hokanson

Young Lieutenant

David Janssen

Monsignor Collins

Richard H. Cutting

Cadet Capt. Petri

Butch Jones

Monsignor Collins

Edward Platt

Nancy (uncredited)

Sue George

Cadet

Steven Benson

Cadet Lt. Hanratty

Mickey Little

Cadet Lt Morelli (uncredited)

Alfred Caiazza