| Regimental number | 6516 |
| Place of birth | Bathurst, New South Wales |
| Religion | Roman Catholic |
| Occupation | Musician |
| Address | Bathurst, New South Wales |
| Marital status | Single |
| Age at embarkation | 23 |
| Height | 5' 8.25" |
| Weight | 173 lbs |
| Next of kin | Mother, Mrs L Ahearn, 44 Durham Street, Bathurst, New South Wales |
| Previous military service | Trainee, 41st Infantry, |
| Enlistment date | |
| Place of enlistment | Bathurst, New South Wales |
| Rank on enlistment | Private |
| Unit name | 20th Battalion, 19th Reinforcement |
| AWM Embarkation Roll number | 23/37/4 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A68 Anchises on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 20th Battalion |
| Fate | Returned to Australia |
| Discharge date | |
| Family/military connections | Brother: 2856 Pte Norman Jerome AHEARN, 5th Australian Infantry Brigade, returned to Australia, 12 June 1919. |
| Other details |
War service: Western Front Granted leave with pay, 5 July-5 September 1919: Non Military Employment (horticulture: attending Lord Rayner, Langford Castle, Salisbury). Commenced return to Australia on board HT 'Port Sydney', 22 September 1919; discharged (termination of period of enlistment), Sydney, 21 December 1919. Medals: British War Medal, Victory Medal |
| Sources | NAA: B2455, AHEARN Harold |