David Watson Izatt was born near Greengairs, Lanarkshire in Scotland during 1889. Before enlisting in the First World War, he described his occupation as being a sailor. He enlisted with the Australian Army Medical Corps at Victoria Barracks in Sydney on 12 October 1914. About 6 weeks later he departed Sydney aboard HMAT Kyarra with other members of the 2nd Australian General Hospital. Izatt served at both Gallipoli and on the Western Front. He was in the last party of Army Medical Corps to leave Gallipoli at 3am on 20 December 1915. Although Izatt was assigned to the 2nd Australian General Hospital, he found himself attached to several other units over the course of the war for varying periods of time. These included the 1st Casualty Clearing Station, the 10th Casualty Clearing Station and the 15th Casualty Clearing Station. David Izatt embarked at Taranto for return to Australia on 8 October 1918.