| Regimental number | 2599 |
| Place of birth | Moree New South Wales |
| Religion | Church of England |
| Occupation | Motor mechanic apprentice |
| Address | Edward Street, Moree, New South Wales |
| Marital status | Single |
| Age at embarkation | 18 |
| Next of kin | Father, William J Mahaffey, Edward Street, Moree, New South Wales |
| Enlistment date | 9 May 1916 |
| Rank on enlistment | Private |
| Unit name | 33rd Battalion, 5th Reinforcement |
| AWM Embarkation Roll number | 23/50/2 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board SS Port Napier on 17 November 1916 |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 33rd Battalion |
| Fate | Returned to Australia 12 December 1918 |