| Regimental number | 7658 |
| Place of birth | Sydney New South Wales |
| Religion | Presbyterian |
| Occupation | Stockman |
| Address | c/o Sydney Ferries Ltd., Sydney, New South Wales |
| Marital status | Single |
| Age at embarkation | 20 |
| Next of kin | Father, W A Mackenzie, c/o Sydney Ferries Ltd., Sydney, New South Wales |
| Enlistment date | 24 September 1915 |
| Rank on enlistment | Gunner |
| Unit name | Field Artillery Brigade 5, Battery 14 |
| AWM Embarkation Roll number | 13/33/1 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A34 Persic on 18 November 1915 |
| Rank from Nominal Roll | Gunner |
| Unit from Nominal Roll | 5th Field Artillery Brigade |
| Fate | Returned to Australia 16 January 1919 |
| Miscellaneous details (Nominal Roll) | *second given name two spellings Merrett and Marrell |