| Regimental number | 3605 |
| Place of birth | Myponga, South Australia |
| Religion | Church of England |
| Occupation | Labourer |
| Address | Cleve, South Australia |
| Marital status | Single |
| Age at embarkation | 25 |
| Height | 5' 7" |
| Weight | 156 lbs |
| Next of kin | Father, Archibald Sinclair, Myponga, South Australia |
| Previous military service | Nil |
| Enlistment date | |
| Place of enlistment | Adelaide, South Australia |
| Rank on enlistment | Private |
| Unit name | 27th Battalion, 8th Reinforcement |
| AWM Embarkation Roll number | 23/44/2 |
| Embarkation details | Unit embarked from Adelaide, South Australia, on board HMAT A30 Borda on |
| Rank from Nominal Roll | Lance Corporal |
| Unit from Nominal Roll | 10th Battalion |
| Fate | Returned to Australia |
| Discharge date | |
| Family/military connections | Brother: 3604 Lance Corporal George Livingstone SINCLAIR, 10th Bn, returned to Australia, 31 December 1918. |
| Other details |
War service: Western Front Commenced return to Australia on board HT 'Ceramic', 25 January 1919; discharged (termination of period of enlistment), Adelaide, 25 May 1919. Medals: British War Medal, Victory Medal |
| Sources | NAA: B2455, SINCLAIR William Charles |