| Regimental number | 2427 |
| Place of birth | Perth, Western Australia |
| Religion | Roman Catholic |
| Occupation | Farmer |
| Address | Trundle, New South Wales |
| Marital status | Single |
| Age at embarkation | 21 |
| Next of kin | Cousin, Miss Eileen O'Brien, Kalgoorlie PO, Kalgoorlie, Western Australia |
| Enlistment date | 13 March 1917 |
| Place of enlistment | Sydney, New South Wales |
| Rank on enlistment | Private |
| Unit name | 12th Light Horse Regiment, 20th Reinforcement |
| AWM Embarkation Roll number | 10/17/3 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A55 Kyarra on 3 September 1917 |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 12th Light Horse Regiment |
| Fate | Returned to Australia 20 July 1919 |
| Other details | Medals: British War Medal, Victory Medal |
| Miscellaneous details | True name: Orlando O'BRIEN |
