Charlton Heston

Maj. Bernard R. 'Barney' Benson

Julie Adams

Dr. Kay Lambert

William Demarest

John

Tim Hovey

Cadet Thomas 'Tiger' Flaherty

Nana Bryant

Mother Redempta

Tim Considine

Cadet Lt. Gerald Hibler

Sal Mineo

Cadet Col. Sylvester Dusik

Milburn Stone

Maj. Gen. Wilton J. Ramsey

Mary Field

Sister Mary Theresa

Joey D. Vieira

Cadet Cpl. Scawalski (as Donald Keeler)

Gary Pagett

Cadet Lt. Molony

Don Haggerty

Harold Hibler

David Janssen

Young Lieutenant

Richard H. Cutting

Monsignor Collins

Sue George

Nancy (uncredited)

Steven Benson

Cadet

Madge Blake

Woman at Airport

Alfred Caiazza

Cadet Lt Morelli (uncredited)