| Regimental number | 68772 |
| Place of birth | Melbourne, Victoria |
| Religion | Roman Catholic |
| Occupation | Postal official |
| Address | Merino, Victoria |
| Marital status | Single |
| Age at embarkation | 21 |
| Next of kin | Father, J Byrnes, Police Station, Merino Station, Victoria |
| Previous military service | 5th Battalion 23rd Infantry |
| Enlistment date | 23 May 1918 |
| Rank on enlistment | Private |
| Unit name | 15th General (Victorian) Reinforcements |
| AWM Embarkation Roll number | 23/111/3 |
| Embarkation details | Unit embarked from Adelaide, South Australia, on board HMAT A36 Boonah on 22 October 1918 |
| Fate | No details of fate entered on Nominal Roll |
| Miscellaneous details (Nominal Roll) | Ship recalled owing to cessation of hostilities. |
| Family/military connections | Brother: 10590 Sapper Thomas Joseph BYRNES, 3rd Divisional Signal Company, returned to Australia, 30 April 1919. |
| Other details | Medal: British War Medal |
