William * O'BRIEN
| Regimental number | 3659 |
| Religion | Roman Catholic |
| Occupation | Cook |
| Address | Ballarat, Victoria |
| Marital status | Single |
| Age at embarkation | 29 |
| Next of kin | Father, T O'Brien, 9 Eyre Street, Ballarat, Victoria |
| Enlistment date | 8 March 1916 |
| Rank on enlistment | Sapper |
| Unit name | |
| AWM Embarkation Roll number | 16/13/1 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A69 Warilda on 22 May 1916 |
| Rank from Nominal Roll | Sapper |
| Unit from Nominal Roll | 1st Tunnelling Company |
| Fate | Returned to Australia 23 March 1919 |
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