| Regimental number | 4521 |
| Religion | Church of England |
| Occupation | Butcher |
| Address | Petersham, New South Wales |
| Marital status | Married |
| Age at embarkation | 36 |
| Next of kin | Wife, Mrs A O'Brien, 5 Railway Street, Petersham, New South Wales |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | 1st Battalion, 14th Reinforcement |
| AWM Embarkation Roll number | 23/18/4 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board RMS Osterley on |
| Rank from Nominal Roll | Corporal |
| Unit from Nominal Roll | 5th Field Butchery |
| Fate | Returned to Australia |
| Family/military connections | Son [?]: 72 Sergeant Denis Joseph O'BRIEN MM, 1st Divisional Signal Company, returned to Australia, 23 October 1918. |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |
Postal Address:
Po Box 7916
Canberra BC 2610, Australia
Street Address:
Northcott Drive,
Campbell, ACT 2600
