| Regimental number | 5673 |
| Place of birth | Mudgeeraba, Queensland |
| School | Mudgeeraba State School, Queensland |
| Religion | Presbyterian |
| Occupation | Farmer |
| Address | Mudgerraba, Queensland |
| Marital status | Single |
| Age at embarkation | 18 |
| Next of kin | Father, George Whitfield Millen, Mudgeeraba, Queensland |
| Previous military service | Nil |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | 25th Battalion, 15th Reinforcement |
| AWM Embarkation Roll number | 23/42/4 |
| Embarkation details | Unit embarked from Brisbane, Queensland, on board HMAT A46 Clan Macgillivray on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 25th Battalion |
| Fate | Killed in Action |
| Place of death or wounding | Villers-Bretonneux, France |
| Age at death | 20.11 |
| Age at death from cemetery records | 20 |
| Place of burial | Adelaide Cemetery (Plot I, Row B, Grave No. 15), Villers-Bretonneux, France |
| Panel number, Roll of Honour, Australian War Memorial | 105 |
| Miscellaneous information from cemetery records | Parents: George and Sarah MILLEN, Mudgeeraba, Queensland |
| Family/military connections | Brother: 181 Pte George Edward MILLEN, 25th Bn, killed in action, 5 August 1918; Uncle: 566 Pte Frederick Alexander ANDERSON, 15th Bn, killed in action, 18 May 1915. |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |