Air Vice Marshal Ian Dougald McLachlan, CB, CBE, DFC was a senior commander in the Royal Australian Air Force (RAAF). Born in Melbourne, he was a cadet at the Royal Military College, Duntroon, before joining the Air Force in December 1930. After serving in instructional and general flying roles, he took command of No. 3 Squadron in December 1939, leading it into action in the Middle East less than a year later. Awarded the Distinguished Flying Cross, he returned to Australia in 1942 to command air bases in Canberra and Melbourne. The following year he was posted to the South West Pacific, where he led successively Nos. 71 and 73 Wings. Having been promoted to group captain, he took charge of Southern Area Command in 1944, and No. 81 Wing in the Dutch East Indies the following year.

No. 3 Squadron is a Royal Australian Air Force (RAAF) fighter squadron, headquartered at RAAF Base Williamtown, near Newcastle, New South Wales. Established in 1916, it was one of four combat squadrons of the Australian Flying Corps during World War I, and operated on the Western Front in France before being disbanded in 1919. It was re-established as a permanent squadron of the RAAF in 1925, and during World War II operated in the Mediterranean Theatre. The Cold War years saw the squadron disbanded and re-raised twice. It was based at RAAF Butterworth during the Malayan Emergency and the Indonesia–Malaysia Konfrontasi. Equipped with McDonnell Douglas F/A-18 Hornet multi-role fighters from 1986, the squadron deployed to Diego Garcia in 2002 to provide local air defence, and the following year contributed aircraft and crews to the invasion of Iraq as part of Operation Falconer. In April 2016, it deployed to the Middle East as part of the military intervention against ISIL. The squadron began re-equipping with Lockheed Martin F-35 Lightning II multi-role fighters in 2018.