First Battalion Four Marines
Personnel Rosters - H&S Company
1 January - 31 December 1965
Tour Date - When Joined Company
| Name | Rank | MOS | Tour | Purple Heart | Purple Heart | KIA |
| Oakes, Joseph E | PFC | 1441 | ||||
| O'Connell, Lawrence F | Sgt | 0341/5591 | ||||
| Olivarri, Louie P | Cpl | 0341 | 22 Oct 65 | |||
| Oliver, Hubert, Jr | Sgt | 0369/2531 | ||||
| Oliver, Raymond O | S/Sgt | 0369 | ||||
| Olson, John A | L/Cpl | 0341 | ||||
| Ortiz, Paulino R | S/Sgt | 0369 | ||||
| Osborne, Joe, Jr | Cpl | 2511 | 29 Aug 65 | |||
| Osborne, Terry O | L/Cpl | 0341 | ||||
| Otahal, Russell R | L/Cpl | 0351 | ||||
| Oxley, Steven D | PFC | 0351 | ||||