| Regimental number | 8367 |
| Place of birth | Sareatla New England |
| Religion | Roman Catholic |
| Occupation | Commercial traveller |
| Address | 'Dagworth', Thomas Street, Lewisham, New South Wales |
| Marital status | Single |
| Age at embarkation | 26 |
| Next of kin | Father, E F Coolahan, 'Dagworth', Thomas Street, Lewisham, New South Wales |
| Enlistment date | 9 September 1915 |
| Rank on enlistment | Driver |
| Unit name | Army Service Corps 20, Headquarters |
| AWM Embarkation Roll number | 25/106/1 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A66 Uganda on 27 November 1915 |
| Rank from Nominal Roll | Driver |
| Unit from Nominal Roll | 14th Company, Australian Army Service Corps |
| Fate | Returned to Australia 12 May 1919 |
| Family/military connections | Brothers: 8368 Driver Ernest COOLAHAN, 14th Company, Australian Army Service Corps, returned to Australia, 12 May 1919; 9457 Driver James Dudley COOLAHAN, Australian Army Service Corps, died of disease, 3 October 1917; 8366 Driver Maurice Stanley COOLAHAN, 14th Company, Australian Army Service Corps, returned to Australia, 22 February 1917; Cousin: Lt John Stephen COOLAHAN MC, 4th Bn, died while a prisoner of war, 3 May 1918. |
