Tab Hunter as Thad Walker

Etchika Choureau as Renee Beaulieu

Marcel Dalio as Drill Sergeant

David Janssen as Duke Sinclair

Paul Fix as U.S. General

Veola Vonn as The Madam

Will Hutchins as Dave Putnam

Clint Eastwood as George Moseley

Robert Hover as Dave Judd (as Bob Hover)

Tom Laughlin as Arthur Blumenthal

Brett Halsey as Frank Baylies

Henry Nakamura as Jimmy

Maurice Marsac as Sgt. Parris

Raymond Bailey as Amos J. Walker

William Wellman Jr. as Bill Wellman Sr.

Jody McCrea as Tom Hitchcock

Denny Devine as Lawrence 'Red' Scanion (as Dennis Devine)

Phil Adams as Landram Ovington (uncredited)

Louis Mercier as Captain Honore (uncredited)

Dick Rich as Policeman (uncredited)

Lomax Study as French Recruiting Officer (uncredited)

Marcel De La Brosse as Interpreter (uncredited)

James Westmoreland as Wally Winter (uncredited)