Non Commissioned Aircrew Rank Badges.

The RAAF was to follow the example of the Royal Air Force and introduce different ranks and insignia for those of non-commissioned rank employed in an aircrew category. This decision is attributed to Air Vice Marshal J E (Joe) Hewit who was Air Member for Personnel.
The ranks (with equivalents in brackets) were:
Aircrew Trainee (Aircraftman)
Aircrew Category IV (Leading Aircraftman)
Aircrew Category III (Corporal)
Aircrew Category II (Sergeant)
Aircrew Category I (Flight Sergeant)
Aircrew Master (Warrant Officer)
The design was adopted from the United Kingdom and the predominant feature was a laurel wreath with stars indicating the seniority and, in the case of Aircrew Master, featured the Royal Coat of Arms at the top of the wreath.
The badges were produced in opposing pairs, on blue melton cloth and in khaki drab types for winter and summer uniforms respectively.