| Regimental number | 2199 |
| Place of birth | Port Adelaide, South Australia |
| Religion | Roman Catholic |
| Occupation | Storekeeper |
| Address | Black Rock, South Australia |
| Marital status | Single |
| Age at embarkation | 26.6 |
| Height | 5' 7.75" |
| Weight | 134 lbs |
| Next of kin | Sister, Mrs Mary Tresa Daly, Terowie, South Australia |
| Previous military service | Nil (previously rejected at Orroroo for enlistment in the AIF) |
| Enlistment date | |
| Place of enlistment | Adelaide, South Australia |
| Rank on enlistment | Private |
| Unit name | 50th Battalion, 4th Reinforcement |
| AWM Embarkation Roll number | 23/67/3 |
| Embarkation details | Unit embarked from Adelaide, South Australia, on board HMAT A70 Ballarat on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 43rd Battalion |
| Fate | Returned to Australia |
| Discharge date | |
| Family/military connections | Brothers: 1678 Lance Corporal Bernard Joseph IRWIN, 48th Bn, died of wounds, 17 October 1917; 6576 Pte Patrick Francis IRWIN, 50th Bn, returned to Australia, 2 January 1919. |
| Other details |
War service: Western Front Commenced return to Australia on board HS 'Karoola', 24 January 1918; discharged (medically unfit: shell wounds, face, left thigh, legs), Adelaide, 2 April 1918. Medals: British War Medal, Victory Medal |
| Sources | NAA: B2455, IRWIN John |