Massachusetts Resident's Casualties in the Korean War - O
| Name | Rank / Grade | Branch | Home of record City / County | Date of Casualty | Type of Casualty |
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OBOYLE JAMES M | CPL | ARMY | BERKSHIRE | 18 MAY 1951 | DIED WHILE CAPTURED
| | OBRIEN ROBERT J | PFC | ARMY | MIDDLESEX | 30 NOV 1950 | DIED WHILE MISSING
| | OCONNEL RICHARD P | PFC | MARINES | WATERTOWN | 19 JUL 1953 | KILLED IN ACTION
| | OCONNELL PAUL H | SFC | ARMY | SUFFOLK | 21 APR 1953 | KILLED IN ACTION
| | OCONNOR WILLIAM J | PFC | ARMY | SUFFOLK | 06 OCT 1951 | KILLED IN ACTION
| | OGDEN CHARLES A | MSGT | ARMY | MIDDLESEX | 01 DEC 1950 | KILLED IN ACTION
| | OHANLON THOMAS R | PFC | ARMY | SUFFOLK | 06 JUN 1951 | KILLED IN ACTION
| | OLDFIELD EDWARD M | PVT | ARMY | BRISTOL | 16 APR 1953 | KILLED IN ACTION
| | OLEARY JAMES P | CPL | ARMY | BRISTOL | 02 NOV 1950 | DIED WHILE CAPTURED
| | OLIVIGNI FRANCIS JOSEPH | SGT | MARINES | NEWTON | 21 NOV 1950 | KILLED IN ACTION
| | OLSEN HUGH A | PFC | ARMY | BERKSHIRE | 02 NOV 1950 | KILLED IN ACTION
| | OLSON WILLIAM T | PFC | MARINES | MALDEN | 28 NOV 1950 | KILLED IN ACTION
| | ONEAL RAYMOND G | PFC | ARMY | MIDDLESEX | 02 NOV 1950 | DIED WHILE CAPTURED
| | ONEIL EDWARD F | CPL | ARMY | ESSEX | 16 JUL 1950 | KILLED IN ACTION
| | OSHEA ALFRED J | PFC | ARMY | SUFFOLK | 14 AUG 1952 | KILLED IN ACTION
| | OTTO ROBERT F | CPL | ARMY | SUFFOLK | 03 SEP 1950 | KILLED IN ACTION
| | OUELLET ALBERT J | CPL | ARMY | ESSEX | 03 SEP 1951 | KILLED IN ACTION
| | OUELLET GEORGE W | PFC | ARMY | BRISTOL | 26 MAY 1951 | DIED OF WOUNDS
| | OUELLETTE JOSEPH R | PFC | ARMY | MIDDLESEX | 03 SEP 1950 | KILLED IN ACTION
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