| Regimental number | 3688 |
| Place of birth | Sydney New South Wales |
| Religion | Church of England |
| Occupation | Warehouseman |
| Address | 60 Short Street, Balmain, New South Wales |
| Marital status | Single |
| Age at embarkation | 19 |
| Next of kin | Mother, Mrs Isabel Allen, 60 Short Street, Balmain, New South Wales |
| Enlistment date | 20 July 1917 |
| Date of enlistment from Nominal Roll | 20 July 1917 |
| Rank on enlistment | Private |
| Unit name | 1st Light Horse Regiment, 33rd Reinforcement |
| AWM Embarkation Roll number | 10/6/5 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board SS Canberra on 16 November 1917 |
| Regimental number from Nominal Roll | 3668A |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 1st Light Horse Regiment |
| Fate | Returned to Australia 26 January 1919 |
| Family/military connections | Brother: 1130 Sergeant Robert Mark ALLEN, 1st Imperial Camel Corps, returned to Australia, 1 January 1919. |
