First Battalion Four Marines
Personnel Rosters - Alpha Company
1 January - 31 December 1965
Tour Date - When Joined Company
| Name | Rank | MOS | Tour | Purple Heart | Purple Heart | KIA |
| Oliver, John, Jr | L/Cpl | 0311 | ||||
| O'Meara, Thomas J | PFC | 0311 | ||||
| O'Neill, Terrance F | Cpl | 0331 | ||||
| Openlander, James P | PFC | 0311 | 6 Aug 65 | |||
| Orosco, Ruben H | PFC | 0300 | 8 Aug 65 | |||
| Orr, Eugene | PFC | 0311 | 8 Aug 65 | |||
| Ortega, Lonnie G | PFC | 0311 | ||||
| Ostrander, Wayne A | PFC | 0300 | 8 Aug 65 | 3 Sep 65 | ||