| Regimental number | 57772 |
| Place of birth | Goondiwindi, Queensland |
| Religion | Roman Catholic |
| Occupation | Railway official |
| Address | Benellowine, Goondiwindi, Queensland |
| Marital status | Single |
| Age at embarkation | 24.4 |
| Height | 5' 10.5" |
| Weight | 160 lbs |
| Next of kin | Mother, Mrs M A Brennan, Benellowine, Goondiwindi, Queensland |
| Previous military service | Nil |
| Enlistment date | |
| Place of enlistment | Brisbane, Queensland |
| Rank on enlistment | Private |
| Unit name | Queensland Reinforcement 4 |
| AWM Embarkation Roll number | 23/111/1 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board RMS Orontes on |
| Rank from Nominal Roll | Corporal |
| Unit from Nominal Roll | Signal Engineers Details |
| Fate | Returned to Australia |
| Discharge date | |
| Family/military connections | Brothers: 4088 Clarence Francis BRENNAN, 26th Bn, returned to Australia, 12 November 1919; 1854 Driver William Vincent BRENNAN, 2nd Field Artillery Brigade, returned to Australia, 27 August 1917. |
| Other details |
War service: England Commenced return to Australia on board HT 'Ypiringa', 15 November 1919; discharged (termination of period of enlistment), Brisbane, 3 February 1920. Medal: British War Medal |
| Sources | NAA: B2455, BRENNAN Malcolm Maurice |