Colorado Residents Casualties in the Vietnam War - O
| Name | Rank / Grade | Branch | Home of record
City / County | Date of Birth | Date of Casualty |
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| | ODELL MICHAEL CHARLES | GMG2 | NAVY | GOLDEN | 10/18/47 | 06/24/67
| | OGBOURN GAYMAN CRANDALL | SGT | MARINES | ELIZABETH | 09/30/47 | 09/06/69
| | ONTIS BILLIE JOE | SP5 | ARMY | DENVER | 02/06/48 | 11/21/68
| | ORSLAND GARY VARNER | PFC | MARINES | BRANSON | 07/15/48 | 07/29/68
| | ORTIZ JACOB | SSGT | ARMY | DENVER | 06/29/41 | 11/12/67
| | ORTIZ RANDALL ISAAC-JED | LCPL | MARINES | DENVER | 03/13/49 | 08/20/69
| | OSBORN DONALD KEITH | CAPT | ARMY | LOVELAND | 07/28/48 | 03/23/71
| | OTTO MICHAEL L | PFC | ARMY | AURORA | 11/16/47 | 05/29/67
| | OWENS RANDY LEE | FN | NAVY | LAKEWOOD | 07/31/49 | 07/31/69
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