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Cliff Robertson as Lt. John F, Kennedy |
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Ty Hardin as Ensign Leonard J. Thom |
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James Gregory as Commander C.R. Ritchie |
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Robert Culp as Ensign George 'Barney' Ross |
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Grant Williams as Lt. Alvin Cluster |
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Lew Gallo as Yeoman Rogers |
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Errol John as Benjamin Kevu |
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Michael Pate as Lt. Reginald Evans |
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Robert Blake as Charles 'Bucky' Harris |
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Biff Elliot as Edgar E. Mauer |
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Norman Fell as Edmund Drewitch |
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James McCallion as Pat McMahon |
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Joseph Gallison as Harold Mamey |
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William Douglas as Gerald Zinser |
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Sam Gilman as Raymond Starkey |
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Clyde Howdy as Leon Drawdy |
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Buzz Martin as Maurice Kowal |
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Sam Reese as Andrew Kirksey |
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Glenn Sipes as William Johnson |
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John Ward as John Maguire |
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David Whorf as Raymond Albert |
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George Takei as Helmsman on Japanese Destroyer (uncredited) |
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Andrew Duggan as Narrator (uncredited) |
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Roger Davis as Radioman (uncredited) |
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Jerry Earle Kraft as Extra (uncredited) |
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George Gaynes as PT Flotilla Captain (uncredited) |
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Chuck Hicks as Cook (uncredited) |
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Dale Ishimoto as Commander (uncredited) |
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Barney Ross as Chief Benson (uncredited) |
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Sheb Wooley as Edmund Drewitch's Scream (archive sound) (uncredited) |
| Writing | Richard L. Breen | Screenplay |
| Writing | Howard Sheehan | Adaptation |
| Writing | Vincent X. Flaherty | Adaptation |
| Writing | Robert J. Donovan | Novel |
| Directing | Leslie H. Martinson | Director |
| Crew | Bob Herron | Stunts |
| Crew | Chuck Hicks | Stunts |
| Costume & Make-Up | Gordon Bau | Makeup Supervisor |
| Crew | Paul Baxley | Stunts |
| Crew | Dean Smith | Stunts |
| Directing | C.M. Florance | Assistant Director |
| Editing | Folmar Blangsted | Editor |
| Sound | David Buttolph | Original Music Composer |
| Production | Bryan Foy | Producer |
| Sound | William Lava | Original Music Composer |
| Art | Leo K. Kuter | Art Direction |
| Art | John P. Austin | Set Decoration |
| Camera | Robert Surtees | Director of Photography |
