| Regimental number | 722 |
| Date of birth | |
| Place of birth | Mount Pleasant, South Australia |
| Religion | Baptist |
| Occupation | Farmer |
| Address | Parilla, South Australia |
| Marital status | Single |
| Age at embarkation | 22 |
| Height | 5' 10" |
| Weight | 144 lbs |
| Next of kin | Father, Edward George Gregory, Parilla, South Australia |
| Previous military service | Nil |
| Enlistment date | |
| Place of enlistment | Morphettville, South Australia |
| Rank on enlistment | Private |
| Unit name | 12th Battalion, F Company |
| AWM Embarkation Roll number | 23/29/1 |
| Embarkation details | Unit embarked from Hobart, Tasmania, on board Transport A2 Geelong on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 12th Battalion |
| Fate | Returned to Australia |
| Discharge date | |
| Other details |
War service: Egypt, Gallipoli, Western Front Commenced return to Australia on board HT 'Ceramic', 25 January 1919; disembarked, 14 March 1919; discharged (termination of period of enlistment), 28 March 1919. War service: 4 years 206 days (of which 4 years 179 days were abroad) Medals: 1914-15 Star, British War Medal, Victory Medal Also served in World War II: enlisted, 29 May 1940; discharged, 14 August 1944, as S213391 Corporal, Provost Section, 4th Military District. |
| Date of death | |
| Age at death | 73 |
| Place of burial | Mitcham Cemetery, Adelaide, South Australia |
| Sources | NAA: B2455, GREGORY Seymour Allan |