William Joseph O'Brien Jr was assigned to the 4th Marine Division.
William received the Purple Heart (PH)
Served during World War II
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The contained information on William Joseph O'Brien Jr is gathered and extracted from military records from a variety of sources. This material in no way represents this serviceman's complete military record; we welcome additional material. If you can help add to William O'Brien's military record please contact us. This can include award citations and photos. 4MARDIV . HQCO, 3BN, 23MAR, 4THMARDIV, FMF.
HQCO, 3BN, 23MAR, 4THMARDIV, FMF
World War II, 1941-1945
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