Lt. John F, Kennedy

Cliff Robertson

Acting

Ensign Leonard J. Thom

Ty Hardin

Acting

Commander C.R. Ritchie

James Gregory

Acting

Ensign George 'Barney' Ross

Robert Culp

Acting

Lt. Alvin Cluster

Grant Williams

Acting

Yeoman Rogers

Lew Gallo

Acting

Benjamin Kevu

Errol John

Acting

Lt. Reginald Evans

Michael Pate

Acting

Charles 'Bucky' Harris

Robert Blake

Acting

Edgar E. Mauer

Biff Elliot

Acting

Edmund Drewitch

Norman Fell

Acting

Pat McMahon

James McCallion

Acting

Harold Mamey

Joseph Gallison

Acting

Gerald Zinser

William Douglas

Acting

Raymond Starkey

Sam Gilman

Acting

Leon Drawdy

Clyde Howdy

Acting

Maurice Kowal

Buzz Martin

Acting

Andrew Kirksey

Sam Reese

Acting

William Johnson

Glenn Sipes

Acting

John Maguire

John Ward

Acting

Raymond Albert

David Whorf

Directing

Helmsman on Japanese Destroyer (uncredited)

George Takei

Acting

Narrator (uncredited)

Andrew Duggan

Acting

Radioman (uncredited)

Roger Davis

Acting

Extra (uncredited)

Jerry Earle Kraft

Acting

PT Flotilla Captain (uncredited)

George Gaynes

Acting

Cook (uncredited)

Chuck Hicks

Acting

Commander (uncredited)

Dale Ishimoto

Acting

Chief Benson (uncredited)

Barney Ross

Acting

Edmund Drewitch's Scream (archive sound) (uncredited)

Sheb Wooley

Acting