Arizona Residents Casualties in the Vietnam War - O
| Name | Rank / Grade | Branch | Home of Record City / County | Date of Birth | Date of Death |
| O BRIEN ARTHUR ALEN | LCPL | MARINES | TOLLESON | 03/14/46 | 01/14/67
| | O BRIEN WILLARD DONALD | SP4 | ARMY | TUCSON | 12/18/49 | 05/11/70
| | O CONNOR MORTIMER LELANE | LTC | ARMY | TUCSON | 06/13/30 | 04/01/68
| | OCHOA JESUS | SGT | AIR FORCE | TUCSON | 06/12/47 | 09/06/68
| | OCHOA RALPH RICHARD | PFC | MARINES | TUCSON | 11/06/48 | 04/21/69
| | OGDEN RUSSELL KEVIN | SP4 | ARMY | APACHE JUNCTION | 03/02/50 | 11/12/68
| | OGILVIE GORDON WILSON | PFC | ARMY | BAKERSFIELD | 10/02/48 | 09/27/68
| | OLEA FRANCISCO HERRERA | CPL | ARMY | AJO | 07/14/48 | 10/09/68
| | OLSON ERICK OWEN | CPL | ARMY | TUCSON | 02/19/49 | 02/06/70
| | OROZCO TONY SALAZAR JR | PFC | MARINES | WINSLOW | 03/05/47 | 08/05/68
| | ORTIZ ANTONIO OLIVAREZ | LTJG | NAVY | PIRTLEVILLE | 05/30/44 | 12/19/70
| | OVIEDO MICHAEL LESLIE | CPL | ARMY | PHOENIX | 07/04/49 | 01/23/69
| | OWEN JOHN WILSON | SP4 | ARMY | PAYSON | 12/16/48 | 07/03/70
| | OXLEY JAMES EDWARD | MAJ | AIR FORCE | WINSLOW | 04/28/25 | 04/22/67
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