| Regimental number | 4296 |
| Place of birth | Belfast, Ireland |
| Religion | Wesleyan |
| Occupation | Carpenter |
| Address | Sydney, New South Wales |
| Marital status | Widower |
| Age at embarkation | 40 |
| Next of kin | Daughter, Miss Elsie Diffen, Children's Home, Parkville, Western Australia |
| Enlistment date | 15 May 1917 |
| Place of enlistment | Blackboy Hill, Western Australia |
| Rank on enlistment | Private |
| Unit name | 1st Pioneer Battalion, 12th Reinforcement |
| AWM Embarkation Roll number | 14/13/5 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A29 Suevic on 21 June 1917 |
| Other details | See 2082 J DIFFEN |
| Sources | NAA: B2455, DIFFEN Joseph |
