| Regimental number | 11027 |
| Place of birth | Dargo, Victoria |
| Religion | Roman Catholic |
| Occupation | Bank clerk |
| Address | 301 Pigdon Street, North Carlton, Victoria |
| Marital status | Single |
| Age at embarkation | 20.2 |
| Height | 5' 10" |
| Weight | 156 lbs |
| Next of kin | Father, Thomas Henry O'Brien, 301 Pigdon Street, North Carlton, Victoria |
| Previous military service | Served for 2 years in the Senior Cadets; 2 years 66th Infantry, Citizen Military Forces. |
| Enlistment date | |
| Place of enlistment | Melbourne, Victoria |
| Rank on enlistment | Sapper |
| Unit name | Divisional Signal Company 3, Reinforcement 1 |
| AWM Embarkation Roll number | 22/13/3 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A11 Ascanius on |
| Rank from Nominal Roll | Sergeant |
| Unit from Nominal Roll | 3rd Divisional Signal Company |
| Fate | Returned to Australia |
| Miscellaneous information from cemetery records | Photo: Peter Dennis |
| Discharge date | |
| Other details |
War service: Western Front Commenced return to Australia on board HT 'Nestor', 1 November 1919; discharged (termination of period of enlistment), Melbourne, 6 February 1920. Medals: British War Medal, Victory Medal |
| Date of death | |
| Age at death | 61 |
| Place of burial | Woden Cemetery, ACT |
| Sources | NAA: B2455, O'BRIEN Joseph Henry |
Postal Address:
Po Box 7916
Canberra BC 2610, Australia
Street Address:
Northcott Drive,
Campbell, ACT 2600
