California Residents Casualties in the Korean War - O
| Name | Rank / Grade | Branch | Home of record City / County | Date of Casualty | Type of Casualty | |
OAR ALWIN D | 1LT | ARMY | LOS ANGELES | 12 MAY 1952 | KILLED IN ACTION
| | OBANA TADASHI | PFC | ARMY | SAN FRANCISCO | 14 OCT 1951 | KILLED IN ACTION
| | OBERSHAW EDWARD JOSEPH | PFC | MARINES | SAN FRANCISCO | 30 NOV 1950 | DIED OF WOUNDS
| | OBREGON EUGENE ARNOLD | PFC | MARINES | LOS ANGELES | 26 SEP 1950 | KILLED IN ACTION
| | OCHOA ARNOLD | PFC | ARMY | LOS ANGELES | 14 AUG 1950 | KILLED IN ACTION
| | OCHOA CLIFFORD PATRICK | CPL | MARINES | LIVERMORE | 02 OCT 1951 | KILLED IN ACTION
| | OCKERT WILLIAM EDWARD | SGT | MARINES | SAUGUS | 26 OCT 1952 | KILLED IN ACTION
| | ODELL FENTON M | 2LT | ARMY | CONTRA COSTA | 02 SEP 1950 | KILLED IN ACTION
| | OGIER RICHARD | PFC | ARMY | LOS ANGELES | 12 AUG 1950 | KILLED IN ACTION
| | OGLESBY ALFRED D | PFC | ARMY | ORANGE | 02 NOV 1950 | DIED WHILE MISSING
| | OKAMURA TOGO | PVT | ARMY | SAN FRANCISCO | 23 NOV 1951 | KILLED IN ACTION
| | OKEEFE JOHN R | PVT | ARMY | LOS ANGELES | 17 SEP 1951 | KILLED IN ACTION
| | OLAGUE RICHARD N | PVT | ARMY | KERN | 02 SEP 1951 | KILLED IN ACTION
| | OLAQUE JOE RODRIGUEZ | SGT | MARINES | FIVE POINTS | 22 AUG 1952 | KILLED IN ACTION
| | OLEKSIUK STEPHEN J | WO | ARMY | LOS ANGELES | 02 DEC 1950 | DIED WHILE MISSING
| | OLIVA LUIS A | CPL | ARMY | LOS ANGELES | 30 OCT 1951 | KILLED IN ACTION
| | OLIVAS ALBERT R | PFC | ARMY | SANTA BARBARA | 04 OCT 1951 | KILLED IN ACTION
| | OLIVAS ALBERT S | PVT | ARMY | LOS ANGELES | 03 AUG 1951 | KILLED IN ACTION
| | OLIVEIRA JOHN A | CPL | ARMY | MERCED | 17 JUL 1952 | DIED WHILE MISSING
| | OLSON ALBERT S | PFC | ARMY | LOS ANGELES | 16 SEP 1950 | KILLED IN ACTION
| | OLSON STANLEY R | PVT | ARMY | CONTRA COSTA | 16 JUL 1950 | KILLED IN ACTION
| | OLVERA ROBERT | PFC | ARMY | LOS ANGELES | 11 JUN 1951 | KILLED IN ACTION
| | OMALLEY THEODORE | SFC | ARMY | LOS ANGELES | 28 NOV 1950 | DIED WHILE MISSING
| | OMELVERY JAMES MIDDEKAUF | PFC | MARINES | OAKLAND | 19 SEP 1950 | KILLED IN ACTION
| | ONEAL HENRY R | PFC | ARMY | SAN BERNARDINO | 28 NOV 1950 | DIED WHILE CAPTURED
| | ONSTOTT HOWARD L | CPL | ARMY | SUTTER | 25 JUL 1950 | DIED WHILE MISSING
| | ORD ALLEN L | CPL | ARMY | SAN DIEGO | 12 APR 1951 | KILLED IN ACTION
| | ORETTA HENRY R | PVT | ARMY | ALAMEDA | 18 MAY 1951 | KILLED IN ACTION
| | ORNELAS PEDRO | PVT | ARMY | LOS ANGELES | 27 JUL 1950 | KILLED IN ACTION
| | OROZCO ISHMAEL | CPL | ARMY | TULARE | 28 JUN 1951 | KILLED IN ACTION
| | ORR CLIFTON C | SFC | ARMY | SAN FRANCISCO | 20 JUL 1950 | KILLED IN ACTION
| | ORTIZ EARL | PVT | ARMY | ALAMEDA | 25 JUL 1950 | KILLED IN ACTION
| | ORTIZ EDMUND E | CPL | ARMY | LOS ANGELES | 13 DEC 1951 | KILLED IN ACTION
| | ORTIZ FRED G | PFC | ARMY | LOS ANGELES | 06 JUN 1951 | KILLED IN ACTION
| | ORTIZ ISABEL A | PFC | ARMY | LOS ANGELES | 02 DEC 1950 | DIED WHILE MISSING
| | ORTIZ RUBEN M | PVT | ARMY | LOS ANGELES | 23 NOV 1951 | KILLED IN ACTION
| | OSANA DAVID | CPL | MARINES | LOS ANGELES | 11 SEP 1951 | KILLED IN ACTION
| | OSTERBERG GERALD ALLEN | CPL | MARINES | SAN FRANCISCO | 22 SEP 1950 | KILLED IN ACTION
| | OSTERGAARD JOSEPH B | PFC | MARINES | RICHMOND | 01 SEP 1950 | KILLED IN ACTION
| | OTOMO BILL M | 1LT | ARMY | LOS ANGELES | 07 FEB 1951 | KILLED IN ACTION
| | OVERMAN LAWRENCE W | SSGT | MARINES | SAN FERNANDO | 11 DEC 1950 | KILLED IN ACTION
| | OVERTON DONALD WESLEY | SGT | AIR FORCE | SOUTH GATE | 31 DEC 1953 | DIED WHILE MISSING
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