First Battalion Four Marines
Personnel Rosters
1 January - 31 December 1967
| Name | Rank | MOS | Company | Tour | Purple Heart | Purple Heart | Purple Heart | KIA |
| O'Brien, Richard H | Cpl | 0311 | HS | 14 Apr 66 | ||||
| Ochoa, Carlos, Jr | L/Cpl | 0341 | B | 18 May 67 | ||||
| O'Dett, Donald R | L/Cpl | 0341 | D | 17 Apr 67 | 8 May 67 | |||
| O'Donnell, Paul F | L/Cpl | 0351 | C/HS | 25 Oct 66 | ||||
| Offutt, David M | Cpl | 0311 | B | 11 Jan 66 | 22 Mar 67 | |||
| Ogden, Dudley J M | PFC | 0331 | A | 27 Oct 67 | ||||
| Ogden, Wayne E | PFC | 0311 | B | 21 Oct 67 | ||||
| Ogle, John P | Cpl | 2511 | HS | 28 Mar 66 | ||||
| OHara, Douglas L | Sgt | 3531 | HS | 5 Apr 66 | ||||
| Ohman, Robert M | 1st/Sgt | 9999 | C | 29 Aug 67 | ||||
| Ohmer, Robert E | Cpl | 0341 | HS | 7 Feb 66 | 24 Mar 67 | |||
| O'Leary, Patrick A | 1st Lt | 0302 | C/HS | |||||
| Olensuk, Kenneth F | L/Cpl | 0311/8651 | A | 6 May 67 | ||||
| Oliver, James L | Cpl | 0351 | HS | 16 May 66 | ||||
| Ollar, David L | Cpl | 0231 | HS | 2 Nov 67 | 23 Dec 67 | |||
| Olsen, Dale B | 1st Lt | 7521 | HS | |||||
| Olson, Mark J | PFC | 0351 | B | 22 Nov 66 | 27 Mar 67 | |||
| Olson, Richard J | PFC | 0311 | D | 19 Oct 67 | ||||
| O'Neill, James M | Cpl | 2511 | HS | 13 Apr 67 | ||||
| Orman, Leonard D | PVT | 0311 | B | 9 Nov 67 | ||||
| Orsorno, Ernest E, III | L/Cpl | 0311 | B | 9 Apr 67 | ||||
| Ortiz, Eliezer | PFC | 0311 | C | 10 Jun 67 | ||||
| Osborn, James O | Cpl | 3371 | HS | |||||
| Osborne, Leonard F | PFC | 0311 | A | 6 Dec 67 | ||||
| Oster, Harvey J | Cpl | 2111 | HS | 10 Nov 66 | ||||
| Otto, James J | Cpl | 1371 | HS | 24 Oct 66 | 23 Mar 67 | |||
| Overton, Jon A | Cpl | 0351 | A | 7 Apr 67 | ||||
| Owens, Andy G | PFC | 0311 | B | 10 Jun 67 | ||||
| Owens, Ersil D | PFC | 0311 | D | 13 Jul 66 | 9 Apr 67 | |||
| Owens, James E | Sgt | 0311 | A | 16 Apr 66 | 20 Feb 67 | |||
| Owens, Jimmy L | L/Cpl | 0311/2141 | D | 22 Oct 67 | ||||
| Owens, John C | Cpl | 0311 | D | 29 Mar 66 | ||||
| Owens, Terrance F | Cpl | 0311 | A | 10 Mar 66 | ||||
| Owens, Tobias E | Sgt | 0331 | C | |||||
| Owens, Wallace J, Jr | L/Cpl | 2531/0311 | HS | 11 Apr 66 | ||||
| Owens, Wiley D | Sgt | 0311 | D | 26 Jun 66 | 28 Feb 67 | 29 Mar 67 | ||
| Oxton, Thomas W | PVT | 0311 | B | 17 Oct 67 | ||||