| Regimental number | 3265 |
| Place of birth | Ballarat, Victoria |
| School | Xavier (Catholic) College, Kew, St Patrick's College, Ballarat and Christian Brothers College, Melbourne, Victoria |
| Other training | Melbourne University |
| Religion | Roman Catholic |
| Occupation | Assistant librarian |
| Address | 'St Exlades', Malvern Road, Malvern, Melbourne, Victoria |
| Marital status | Single |
| Age at embarkation | 22 |
| Next of kin | Father, Thomas V Slattery, State School, Bunyip, Victoria |
| Previous military service | Nil. |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | 24th Battalion, 7th Reinforcement |
| AWM Embarkation Roll number | 23/41/2 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A73 Commonwealth on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 8th Battalion |
| Other details from Roll of Honour Circular | Was studying for his Arts degree at university and half way through his second year when he enlisted. He spoke French and German fluently. |
| Fate | Died of wounds |
| Miscellaneous details (Nominal Roll) | *Given name Leo Vincent |
| Place of death or wounding | Pozieres, Somme Sector, France |
| Age at death | 23 |
| Age at death from cemetery records | 23 |
| Place of burial | Puchevillers British Cemetery (Plot II, Row A, Grave No. 39), France |
| Panel number, Roll of Honour, Australian War Memorial | 54 |
| Miscellaneous information from cemetery records | Parents: Thomas and Kathleen SLATTERY, "St. Grelades", Malvern Road, East Malvern, Melbourne. Native of Ballarat, Victoria |
| Family/military connections | Brother: No.122 (39323) Private Francis Xavier Slattery. |