| Regimental number | 2719 |
| Place of birth | Lefroy, Tasmania |
| Religion | Roman Catholic |
| Occupation | Miner |
| Address | Gladstone, Tasmania |
| Marital status | Single |
| Age at embarkation | 21.6 |
| Height | 6' 0" |
| Weight | 148 lbs |
| Next of kin | Mother, Mrs Margaret O'Halloran, Gladstone, Tasmania |
| Previous military service | Nil ('service evaded') |
| Enlistment date | |
| Place of enlistment | Claremont, Tasmania |
| Rank on enlistment | Private |
| Unit name | 12th Battalion, 8th Reinforcement |
| AWM Embarkation Roll number | 23/29/2 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT Makarini on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 52nd Battalion |
| Fate | Returned to Australia |
| Miscellaneous details (Nominal Roll) | *Spelt Matthew James O'Halloran on NR |
| Discharge date | |
| Other details |
War service: Egypt, Western Front Commenced return to Australia on board HT 'Armagh', 5 April 1919; discharged (medically unfit: gun shot wound, abdomen), Hobart, 4 August 1919. Medals: 1914-15 Star, British War Medal, Victory Medal |
| Sources | NAA: B2455, O'HALLORAN Mathew James |