| Regimental number | 4930 |
| Religion | Roman Catholic |
| Occupation | Farmer |
| Marital status | Single |
| Age at embarkation | 23 |
| Next of kin | Brother, B O'Callaghan, 14th Battaltion, Australian Imperial Forces |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | No 1 Australian General Hospital |
| Embarkation details | Unit embarked from Fremantle, Western Australia, on board A62 Wandilla on |
| Rank from Nominal Roll | Sergeant |
| Unit from Nominal Roll | 13th Light Horse Regiment |
| Fate | Effective abroad (still overseas) |
| Medals |
Military Medal Source: 'Commonwealth Gazette' No. 31 Date: |