| Regimental number | 178 |
| Date of birth | |
| Other Names | JARRETT, William Duncan~ |
| Religion | Church of England |
| Occupation | Farmer |
| Address | Carronbrook, Singleton, New South Wales |
| Marital status | Single |
| Age at embarkation | 23 |
| Next of kin | George Jarrett, Carronbrook, Singleton, New South Wales |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | 1st Light Horse Regiment, A Squadron |
| AWM Embarkation Roll number | 10/6/1 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A16 Star of Victoria on |
| Regimental number from Nominal Roll | Commissioned |
| Rank from Nominal Roll | Lieutenant |
| Unit from Nominal Roll | 1st Light Horse Regiment |
| Promotions |
2nd Lieutenant Unit: LH1 Promotion date: Lieutenant Unit: LH1 Promotion date: |
| Fate | Returned to Australia |