| Regimental number | 3701 |
| Place of birth | Brisbane Queensland |
| Religion | Church of England |
| Occupation | Shop assistant |
| Address | East Brisbane, Queensland |
| Marital status | Single |
| Age at embarkation | 18 |
| Next of kin | Father, Charles William Henry O'Brien, Caswell Street, East Brisbane, Queensland |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | 49th Battalion, 10th Reinforcement |
| AWM Embarkation Roll number | 23/66/3 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A7 Medic on |
| Regimental number from Nominal Roll | 3701B |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 25th Battalion |
| Fate | Returned to Australia |
Postal Address:
Po Box 7916
Canberra BC 2610, Australia
Street Address:
Northcott Drive,
Campbell, ACT 2600
