Commemorated at Memorial Name Woolgoolga Public School First World War Roll of Honour and Second World War Commemorative Plaque Given name R Family name O'Callaghan Gender Male Service number 16131 Conflicts First World War, 1914–18 Additional information Last held rank Sapper Unit at embarkation 1st Field Company Engineers 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