| Regimental number | 298 |
| Place of birth | Mount Gambier, South Australia |
| Religion | Church of England |
| Occupation | Mercer |
| Address | James Street, Mount Gambier, South Australia |
| Marital status | Single |
| Age at embarkation | 28 |
| Height | 5' 7.5" |
| Weight | 176 lbs |
| Next of kin | Father, Harry Gaillard, Mount Gambier, South Australia |
| Previous military service | Served for 4 years in the 16th Australian Light Horse Regiment, Citizen Military Forces. |
| Enlistment date | |
| Place of enlistment | Morphettville, South Australia |
| Rank on enlistment | Private |
| Unit name | 3rd Light Horse Regiment, B Squadron |
| AWM Embarkation Roll number | 10/8/1 |
| Embarkation details | Unit embarked from Adelaide, South Australia, on board HMAT A17 Port Lincoln on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 3rd Light Horse Regiment |
| Fate | Returned to Australia |
| Discharge date | |
| Other details |
War service: Egypt, Gallipoli Commenced return to Australia from Suez on board HT 'Clan McGillivray', 10 July 1916; discharged (medically unfit), 2 October 1916. Medals: 1914-15 Star, British War Medal, Victory Medal |
| Sources | NAA: B2455, GAILLARD Reginald Buchanan |