| Regimental number | 3347 |
| Religion | Roman Catholic |
| Occupation | Bootmaker |
| Address | 93 Moray Street, South Melbourne, Victoria |
| Marital status | Widower |
| Age at embarkation | 44 |
| Next of kin | Son, Walter Francis O'Brien, c/o John Connell, Bourke Street, Melbourne, Victoria |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Rank on enlistment | Private |
| Unit name | 3rd Pioneer Battalion, Reinforcement 7 |
| AWM Embarkation Roll number | 14/15/3 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A32 Themistocles on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 3rd Pioneer Battalion |
| Fate | Returned to Australia |
Postal Address:
Po Box 7916
Canberra BC 2610, Australia
Street Address:
Northcott Drive,
Campbell, ACT 2600
