31 March - The Royal Australian Air Force was established.

 

The Royal Australian Air Force (RAAF) was indeed established on March 31, 1921. Initially, it was known as the Australian Air Force (AAF) until it received the royal prefix in August 1921, becoming the Royal Australian Air Force. The RAAF is the aerial warfare branch of the Australian Defence Force and has played significant roles in various military operations and conflicts throughout its history, including World War II and subsequent international deployments.