No. 5 Squadron was a Royal Australian Air Force training, army co-operation and helicopter squadron. The squadron was formed in 1917 as a training unit of the Australian Flying Corps in Britain, readying pilots for service on the Western Front. It subsequently became a naval fleet co-operation squadron, but was later redesignated as No. 9 Squadron RAAF before being re-formed as an army co-operation squadron during World War II. In the mid-1960s, it was re-formed as a helicopter squadron, before being disbanded in December 1989, when it was used to form the Australian Defence Force Helicopter Training School.

The Royal Australian Air Force (RAAF) is the principal aerial warfare force of Australia, a part of the Australian Defence Force (ADF) along with the Royal Australian Navy and the Australian Army. Constitutionally the Governor-General of Australia is the de jure Commander-in-Chief of the Australian Defence Force. The Royal Australian Air Force is commanded by the Chief of Air Force (CAF), who is subordinate to the Chief of the Defence Force (CDF). The CAF is also directly responsible to the Minister for Defence, with the Department of Defence administering the ADF and the Air Force.