| Regimental number | 3859 |
| Place of birth | Melbourne, Victoria |
| School | Melton State School, Victoria |
| Religion | Roman Catholic |
| Occupation | Labourer |
| Address | 92 Cobden Street, Kew, Victoria |
| Marital status | Single |
| Age at embarkation | 21 |
| Next of kin | Aunt, Mrs L Howard, 40 McGregor Street, Middle Park, Victoria |
| Previous military service | Nil |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | 7th Battalion, 12th Reinforcement |
| AWM Embarkation Roll number | 23/24/3 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A40 Ceramic on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 57th Battalion |
| Fate | Killed in Action |
| Place of death or wounding | Glencorse Wood, Ypres, Belgium |
| Age at death | 22 |
| Age at death from cemetery records | 23 |
| Place of burial | Bedford House Cemetery Enclosure No. 4 (Plot III, Row B, Grave No. 9), Zillebeke, Belgium |
| Panel number, Roll of Honour, Australian War Memorial | 164 |
| Miscellaneous information from cemetery records | Parents: John and Mary O'CALLAGHAN |
| Family/military connections | Brother: 1832 Corporal John Edward O'CALLAGHAN, 46th Bn, killed in action, 10 April 1917. |
Postal Address:
Po Box 7916
Canberra BC 2610, Australia
Street Address:
Northcott Drive,
Campbell, ACT 2600
