| Regimental number | 33930 |
| Place of birth | Sydney New South Wales |
| Religion | Church of England |
| Occupation | Farmer |
| Address | Hillview, Stockinbingal, New South Wales |
| Marital status | Single |
| Age at embarkation | 28.8 |
| Height | 6' 0.5" |
| Weight | 178 lbs |
| Next of kin | Father, D C McLachlan, Bradley's Head Road, Mosman, Sydney, New South Wales |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Place of enlistment | Cootamundra, New South Wales |
| Rank on enlistment | Driver |
| Unit name | Field Artillery Brigade, March 1917 Reinforcements |
| AWM Embarkation Roll number | 13/128/1 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A74 Marathon on |
| Rank from Nominal Roll | Driver |
| Unit from Nominal Roll | 5th Field Artillery Brigade |
| Fate | Returned to Australia |
| Discharge date | |
| Other details |
War service: Western Front Commenced return to Australia on board HT 'Cluny Castle', 23 March 1919; discharged (termination of period of enlistment), Sydney, 22 June 1919. Medals: British War Medal, Victory Medal |
| Date of death | |
| Age at death | 88.6 |
| Place of burial | Stockinbingal Cemetery, New South Wales |
| Sources | NAA: B2455, McLACHLAN Reginald Obed |