Klaus Ducker left Germany as a refugee and arrived in Australia in 1941 at the age of eight. He attended Ivanhoe Grammar School from 1942 until 1946 and graduated from the Royal Military College, Duntroon in 1955. His postings included: Platoon Commander, Malaya in 1957-1958 during which time he was awarded the Military Cross; 3 Cadet Brigade in Victoria where he helped establish the Ivanhoe Grammar School Cadet unit in 1960-61; and Company Commander in Borneo 1966 and in Vietnam 1969 where he was “mentioned in despatches”. Subsequently, he was a Committee Secretary at the Senate. As a member of the Commonwealth Public Service, he was Director Vital Installations, Director Protective Security, Director Electoral Policy and finally Director of Defence Export Control.