| Regimental number | 8840 |
| Place of birth | Cullerin, New South Wales |
| Religion | Roman Catholic |
| Occupation | Grazier |
| Address | Wyalong, New South Wales |
| Marital status | Single |
| Age at embarkation | 23 |
| Height | 5' 8" |
| Weight | 168 lbs |
| Next of kin | Father, Frank Hannan, Wyalong, New South Wales |
| Previous military service | Served for 2 years in (Voluntary) School Cadets; member for 6 months, Gunning Rifle Club. |
| Enlistment date | |
| Place of enlistment | Liverpool, New South Wales |
| Rank on enlistment | Private |
| Unit name | 1st Light Horse Field Ambulance, 14th Reinforcement |
| AWM Embarkation Roll number | 26/39/3 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A70 Ballarat on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 2nd Pioneer Battalion |
| Fate | Returned to Australia |
| Discharge date | |
| Other details |
War service: Egypt, Western Front Commenced return to Australia on board HT 'Plassy', 17 March 1919; disembarked Sydney, 3 May 1919; discharged (medically unfit), Sydney, 21 June 1919. Medals: British War Medal, Victory Medal |
| Date of death | |
| Place of burial | Mutmutbilly Catholic Cemetery, Beadalbane, New South Wales |
| Sources | NAA: B2455, HANNAN Leslie Joseph |