First Battalion Four Marines
Personnel Rosters
1 January - 31 December 1966
| Name | Rank | MOS | Company | Tour | Purple Heart | Purple Heart | Purple Heart | KIA |
| Yadesky, Joseph A | Cpl | 0341/0351 | HS | 20 May 66 | ||||
| Yancy, Stephen L | L/Cpl | 0311 | B | 17 Oct 66 | ||||
| Yarnell, Paul R, Jr | L/Cpl | 0331 | B | |||||
| Ybarra, Alfonso M | Sgt | 0311 | A | 24 Dec 65 | ||||
| Yeack, James L | L/Cpl | 0311 | HS | |||||
| Yeager, Howard W, Jr | Cpl | 0341 | HS | 15 Sep 66 | 16 Sep 66 | |||
| Yeates, Fredrick E | L/Cpl | 0311 | B | 22 Aug 66 | ||||
| Yepez, John F | PFC | 0311 | HS | 8 Oct 66 | ||||
| Yonkos, Edward G | L/Cpl | 3531 | HS | 20 May 66 | ||||
| York, James A | L/Cpl | 0353 | HS | |||||
| Young, James H | Cpl | 0141 | HS | |||||
| Young, Joseph M, Jr | Sgt | 0369 | C | |||||
| Young, Robert L | PFC | 0351 | HS | 29 Oct 66 | ||||
| Youngcourt, Robert W | PFC | 0311 | B | |||||
| Yount, James F | Cpl | 0300 | A | |||||