
Michael James O'BRIEN
| Regimental number | 1917 |
| Religion | Roman Catholic |
| Occupation | Labourer |
| Address | Smithton, Tasmania |
| Marital status | Single |
| Age at embarkation | 45 |
| Next of kin | , Smithton, Tasmania |
| Enlistment date | 15 March 1916 |
| Date of enlistment from Nominal Roll | 18 May 1916 |
| Rank on enlistment | Private |
| Unit name | 40th Battalion, 2nd Reinforcement |
| AWM Embarkation Roll number | 23/57/2 |
| Embarkation details | Unit embarked from Hobart, Tasmania, on board HMAT A70 Ballarat on 8 August 1916 |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 40th Battalion |
| Fate | Returned to Australia 27 May 1919 |
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