Commemorated at Memorial Name Tallawang Public School First World War Memorial Cabinet Given name Thomas Family name O'Brien Gender Male Service number 2223 Conflicts First World War, 1914–18 Additional information Address given on enlistment documents Last held rank Private Unit at embarkation 1st Pioneer Battalion, 3rd Reinforcement Service Australian Army - First Australian Imperial Force (1st AIF) Do you know more about this war Veteran? Click here to learn how you can contribute