First Battalion Four Marines
Personnel Rosters - Alpha Company
1 January - 31 December 1966
Tour Date - When Joined Company
| Name | Rank | MOS | Tour | Purple Heart | Purple Heart | KIA |
| O'Connell, Roderick D | Cpl | 0311 | 26 Aug 66 | |||
| Oehlke, Wayne M | L/Cpl | 0351 | ||||
| O'Meara, Thomas J | PFC | 0311 | ||||
| Owen, Robert G | PFC | 0311 | 4 May 66 | |||
| Owens, James E | Cpl | 0311 | 4 May 66 | |||
| Owens, Johnny | Sgt | 0369/0311 | 15 Apr 66 | |||
| Owens, Terrance F | Cpl | 0311 | 4 Apr 66 | |||
| Ortega, Lonnie G | PFC | 0341/0311 | ||||