 Cliff RobertsonLt. John F, Kennedy | Lt. John F, Kennedy |
 Ty HardinEnsign Leonard J. Thom | Ensign Leonard J. Thom |
 James GregoryCommander C.R. Ritchie | Commander C.R. Ritchie |
 Robert CulpEnsign George 'Barney' Ross | Ensign George 'Barney' Ross |
 Grant WilliamsLt. Alvin Cluster | Lt. Alvin Cluster |
 Lew GalloYeoman Rogers | Yeoman Rogers |
 Errol JohnBenjamin Kevu | Benjamin Kevu |
 Michael PateLt. Reginald Evans | Lt. Reginald Evans |
 Robert BlakeCharles 'Bucky' Harris | Charles 'Bucky' Harris |
 Biff ElliotEdgar E. Mauer | Edgar E. Mauer |
 Norman FellEdmund Drewitch | Edmund Drewitch |
 James McCallionPat McMahon | Pat McMahon |
 Joseph GallisonHarold Mamey | Harold Mamey |
| WWilliam DouglasGerald Zinser | Gerald Zinser |
 Sam GilmanRaymond Starkey | Raymond Starkey |
| CClyde HowdyLeon Drawdy | Leon Drawdy |
 Buzz MartinMaurice Kowal | Maurice Kowal |
| SSam ReeseAndrew Kirksey | Andrew Kirksey |
| GGlenn SipesWilliam Johnson | William Johnson |
 John WardJohn Maguire | John Maguire |
| DDavid WhorfRaymond Albert | Raymond Albert |
 George TakeiHelmsman on Japanese Destroyer (uncredited) | Helmsman on Japanese Destroyer (uncredited) |
 Andrew DugganNarrator (uncredited) | Narrator (uncredited) |
 Roger DavisRadioman (uncredited) | Radioman (uncredited) |
| JJerry Earle KraftExtra (uncredited) | Extra (uncredited) |
 George GaynesPT Flotilla Captain (uncredited) | PT Flotilla Captain (uncredited) |
 Chuck HicksCook (uncredited) | Cook (uncredited) |
 Dale IshimotoCommander (uncredited) | Commander (uncredited) |
| BBarney RossChief Benson (uncredited) | Chief Benson (uncredited) |
 Sheb WooleyEdmund Drewitch's Scream (archive sound) (uncredited) | Edmund Drewitch's Scream (archive sound) (uncredited) |
