| Regimental number | 1016 |
| Religion | Roman Catholic |
| Occupation | Labourer |
| Address | Melrose P.O., South Australia |
| Marital status | Single |
| Age at embarkation | 24 |
| Next of kin | Brother, T. O'Callaghan, Melrose P.O., South Brunswick |
| Enlistment date | 29 December 1914 |
| Rank on enlistment | Private |
| Unit name | 9th Light Horse Regiment, 6th Reinforcement |
| AWM Embarkation Roll number | 10/14/2 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A19 Afric on 22 May 1915 |
| Embarkation details | Unit embarked from Adelaide, South Australia, on board HMAT A19 Afric on 26 May 1915 |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 14th Field Artillery Brigade |
| Fate | Returned to Australia 2 March 1919 |
