| Date of birth | |
| Religion | Church of England |
| Occupation | Civil servant |
| Address | Aston, Clefton Avenue, Burwood, New South Wales |
| Marital status | Single |
| Age at embarkation | 24 |
| Height | 5' 10" |
| Weight | 159 lbs |
| Next of kin | Mother, Mrs. Victoria Alberta Coates, Aston, Clefton Avenue, Burwood, New South Wales |
| Enlistment date | |
| Rank on enlistment | Lieutenant |
| Unit name | 6th Light Horse Regiment, 11th Reinforcement |
| AWM Embarkation Roll number | 10/11/3 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A14 Euripides on |
| Rank from Nominal Roll | Major |
| Unit from Nominal Roll | 5th Division Artillery |
| Promotions |
Captain Unit: 5th Division artillery Promotion date: |
| Fate | Returned to Australia |
| Discharge date | |
| Other details |
War service: Egypt, Western Front Promoted Captain, 5 June 1916; Major, 23 October 1918. Granted leave with pay only (Non-Military Employment), 28 April-28 July 1919 (shipping). Commenced return to Australia on board HT 'Orsova', 18 July 1919; appointment terminated (discharged), 24 November 1919. Medals: 1914-15 Star, British War Medal, Victory Medal Also served in World War II: Service No N74227. |
| Date of death | |
| Age at death | 72 |
| Place of burial | Northern Suburbs Crematorium, Chatswood, New South Wales |
| Sources | NAA: B2455, COATES Reginald Stanley |