BR71 will be able to put some more detail on this. But basically 9 SQN came back to Amberley from Vietnam at the end of 1971. The UH-1H at this stage was still in overall olive green. Over the next few years - I guess about 1973-1975 - some schemes were trialled, and this was the one that eventually won out. This was also the final scheme when aircraft were handed over to the Army about 1989, and some gifted to PNG.
Interesting to note that in this mid-70s period, the "RAAF" marked on the fuselage sides was changed to "AIR FORCE" (remember BD?), because the media always reported "Army" choppers carrying out rescues and flood relief, etc !!
Nothing changes. The media also reported today that Army aircraft were evacuting people from Cairns to Brisbane - evacuations of course have been by C-17 and C-130. Gotta laugh, but the media do not know the difference between the ADF, RAAF and Army.
