Here is a pack of roundel's and fin-flashes used by the UK Royal Air Force (also used by the Royal Navy Fleet Air Arm and British Army Air Corps). All roundels are 24 vertices. Feel free to use for your addons, please credit me if you do.
Roundel and Fin flash name and colours taken from Wikipedia. This is also a good source of the different types A,B,C etc: https://en.wikipedia.org/wiki/Royal_Air_Force_roundels
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