A Roundel ...

... for folks who just DON'T take themselves all THAT seriously.  ;-)

From the Royal Australian Air Force ( https://www.airforce.gov.au/about-us/your-air-force/roundel ) ...

A roundel is a circular disc used as a symbol. In order to identify aircraft, the Royal Australian Air Force initially adopted the Royal Air Force's red, white and blue roundel.

During World War II, when an 11 Squadron Catalina was mistaken for a Japanese aircraft by a United States Navy Wildcat, the red inner circle was removed, but re-introduced after the war.

On 2 July 1956, the red kangaroo ‘in motion' was chosen as the most popular centrepiece from a range of other options (including the Southern Cross, a boomerang and a sprig of wattle). It has been displayed with pride, not only on aircraft, but on various promotional material since 1982.

The kangaroo within the Air Force Roundel always faces to the left except when used on aircraft or vehicles, when the kangaroo should always face the front of the aircraft or vehicle.

Copyright

Copyright restrictions apply to the use of any Royal Australian Air Force logo. They are protected nationally and internationally by the Defence Act 1903, Trade Marks Act 1995 and the Chester Herald Act 1939.

I think it takes SOME VERY COOL GUYS to adopt something like THIS to go on their warbirds; guys who just  DON'T take themselves all THAT seriously.  ;-)

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