| Regimental number | 2037 |
| Place of birth | Rocklea, Queensland |
| Religion | Methodist |
| Occupation | Selector |
| Address | Toowoomba, Queensland |
| Marital status | Single |
| Age at embarkation | 23 |
| Height | 5' 9" |
| Weight | 149 lbs |
| Next of kin | Father, John Sinnamon, Jackson, Queensland |
| Previous military service | Nil |
| Enlistment date | |
| Place of enlistment | Toowoomba, Queensland |
| Rank on enlistment | Private |
| Unit name | 52nd Battalion 3rd Reinforcement |
| AWM Embarkation Roll number | 23/69/3 |
| Embarkation details | Unit embarked from Brisbane, Queensland, on board HMAT A46 Clan Mcgillivray on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 50th Battalion |
| Fate | Returned to Australia |
| Discharge date | |
| Family/military connections | Brother: 3894 Pte Archibald Wilfred SINNAMON, 31st Bn, killed in action, 29 September 1917. |
| Other details |
War service: Egypt, Western Front Commenced return to Australia on board HT 'Port Lincoln', 23 July 1919; disembarked Sydney, 20 September 1919; discharged (termination of period of enlistment), Brisbane, 13 November 1919. Medals: British War Medal, Victory Medal |
| Sources | NAA: B2455, SINNAMON Walter John |