U.S. Army
William J O'Brien
March 26, 1889—November 3, 1964
CPL
Life Timeline
75 years1889
Born
March 26, 1889
US ARMY
Service Record
World War I
World War I
Conflict
CPL
1964
Passed Away
November 3, 1964
Service Record
Verified fields from cemetery source data.
Branch
US ARMY
Rank
CPL
War / Conflict
World War I
Sourced from official cemetery data; last updated May 30, 2026.Learn more