Lieutenant General Sir Donald Beaumont Dunstan AC, KBE, CB (18 February 1923 – 15 October 2011) was an Australian Army officer who was Governor of South Australia from 23 April 1982 until 5 February 1991. A career officer, after joining the Army in 1940 during the Second World War, Dunstan graduated from the Royal Military College, Duntroon in 1942 and served as an infantry officer, seeing combat against the Japanese during the Bougainville Campaign in 1945. After the war, he served in a variety of appointments, including as commander of the 1st Australian Task Force during the Vietnam War. From 1977 to 1982 he held the appointment of Chief of the General Staff, before retiring from the Army having overseen a large-scale re-organisation. Afterwards, he became the longest-serving Governor of South Australia. He died in 2011, at the age of 88.
Born in Murray Bridge, South Australia, on 18 February 1923, Dunstan joined the Australian Army and was accepted into the Royal Military College, Duntroon in February 1940 amidst the backdrop of the Second World War. A career officer, after graduating from Duntroon in June 1942, having completed a cut-down 18-month version of the normally four-year course, Dunstan was allocated to the infantry and posted to the 27th Battalion, a South Australian Militia unit known as the South Australian Scottish Regiment. He subsequently served with the 27th until the end of the war, except for a brief period when he was seconded to headquarters 23rd Brigade.