| Regimental number | 1620 |
| Place of birth | Norwood, South Australia |
| Religion | Presbyterian |
| Occupation | Butcher |
| Address | Yancannia Station, New South Wales |
| Marital status | Single |
| Age at embarkation | 31.3 |
| Height | 5' 4.25" |
| Weight | 154 lbs |
| Next of kin | Brother, Herbert Lionel Mellowship, Police Station, Port Adelaide, South Australia |
| Previous military service | Nil |
| Enlistment date | |
| Place of enlistment | Keswick, South Australia |
| Rank on enlistment | Private |
| Unit name | 3rd Light Horse Regiment, 12th Reinforcement |
| AWM Embarkation Roll number | 10/8/3 |
| Embarkation details | Unit embarked from Adelaide, South Australia, on board HMAT A2 Geelong on |
| Rank from Nominal Roll | Driver |
| Unit from Nominal Roll | 11th Field Artillery Brigade |
| Fate | Returned to Australia |
| Discharge date | |
| Family/military connections | Brother: 5381 Pte Herbert Lionel MELLOWSHIP, 27th Bn, died of wounds, 5 May 1917. |
| Other details |
War service: Egypt, Western Front Commenced return to Australia on board HT 'Warwickshire', 5 April 1919; discharged (termination of period of enlistment), Adelaide, 18 July 1919. Medals: 1914-15 Star, British War Medal, Victory Medal |
| Sources | NAA: B2455, MELLOWSHIP Alexander Reginald |