| Last Name | First Name | M.I. | Rank | Service/Serial # | Branch | War/Conflict | Cemetery/Memorial | Entered From | Unit |
|---|---|---|---|---|---|---|---|---|---|
| O'Brien | John | C. | Coxswain | 2251879 | U.S. Navy | World War II | Cambridge American Cemetery | New York | |
| O'Brien | John | G. | Second Lieutenant | O-698757 | U.S. Army Air Forces | World War II | Cambridge American Cemetery | New York | 785th Bomber Squadron, 466th Bomber Group, Heavy |
| O'Brien | John | T. | Sergeant | 32382934 | U.S. Army Air Forces | World War II | Cambridge American Cemetery | New York | Air Corps |
| O'Brien | Joseph | F. | Seaman First Class | 2251270 | U.S. Navy | World War II | Cambridge American Cemetery | New Jersey | |
| O'Brien | Lenhart | P. | Private First Class | 6575855 | U.S. Army | World War II | Cambridge American Cemetery | North Dakota | 16th Postal Regulation Section |
| O'Brien | Vincent | E. | Staff Sergeant | 36557569 | U.S. Army Air Forces | World War II | Cambridge American Cemetery | Michigan | 423rd Bomber Squadron, 306th Bomber Group, Heavy |
| O'Brien | Vincent | P. | Seaman First Class | 2051840 | U.S. Navy | World War II | Cambridge American Cemetery | Rhode Island | United States Naval Reserve |
| O'Bryan | Charles | E. | Private | 20746704 | U.S. Army | World War II | Cambridge American Cemetery | Missouri | 377th Field Artillery Bn, 101st Airborne Division |
| O'Byrne | John | F. | Yeoman Second Class | 8100943 | U.S. Navy | World War II | Cambridge American Cemetery | New York | United States Naval Reserve |
| O'Connell | Gene | F. | Second Lieutenant | O-717487 | U.S. Army Air Forces | World War II | Cambridge American Cemetery | Minnesota | 350th Bomber Squadron, 100th Bomber Group, Heavy |