|Place of birth||Barraba, New South Wales|
|Religion||Church of England|
|Address||62 Fitzroy Street, Surry Hills, New South Wales|
|Age at embarkation||21|
|Next of kin||Mother, Mrs. E. Sinclair, 62 Fitzroy Street, Surry Hills, New South Wales|
|Previous military service||Nil|
|Rank on enlistment||Private|
|Unit name||6th Light Horse Regiment, 25th Reinforcement|
|AWM Embarkation Roll number||10/11/4|
|Embarkation details||Unit embarked from Melbourne, Victoria, on board HMAT A42 Boorara on
|Rank from Nominal Roll||Driver|
|Unit from Nominal Roll||Anzac Mounted Division Train|
|Fate||Returned to Australia
|Family/military connections||Brother: 2629 Pte William James SINCLAIR, 12th Light Horse Regiment, returned to Australia, 12 March 1919.|
War service: Middle East
Disembarked Suez, 20 June 1917 (suffering from venereal disease); admitted to 26th Stationary Hospital, Ismailia, 21 June 1917; transferred to 14th General Hospital, Cairo, 23 June 1917; discharged, 8 July 1917. Total treatment for venereal disease: 19 days.
Transferred to Australian Army Service Corps Divisional Train, Moascar, 29 July 1917. Appointed Driver, 13 August 1917. Marched out to No. 2 company, Australian Mounted Divisional Train, 20 August 1917; transferred to Headquarters, AMDT, 24 August 1917. Appointed Lance Corporal, 1 September 1918.
Commenced return to Australia from Kantara on board HT 'Oxfordshire', 10 July 1919; disembarked Sydney, 17 August 1917; discharged, 18 September 1919.
Medals: British War Medal, Victory Medal