Just as an aside to the Westall incident, and the supposition of aircraft of an unusual type and ability existing as part of military programs, I must make mention of a few odd aircraft and their dates of manufacture/operation...
The Flying Flapjack - 1945, USA
The Sack AS-6 - 1939, Germany
Neither of these craft would not have (I suspect) the ability to do what the witnesses saw, but who knows if experiments continued into the 60's to perfect designs and efficiency? Yes, this is Australia, and I could be talking nonsense, but there's one more aircraft that would instantly make someone seeing it suspect it was a UFO, so unlike any other military aircraft it resembles.
I present for your edification, the Avrocar, or Project 1794, if you prefer.
https://www.popularmechanics.com/milita ... -15075926/
This particular experimental US Aircraft, the Avro Canada VZ-9 Avrocar, looks exactly like a traditional 'flying saucer', and was designed in the mid 1950's.
It was capable of vertical take-off and landing (VTOL), but was too unstable in the air to be of any reliable use, so was canned in the early '60's.
Now, I wonder where they got the idea for that craft from, hmm?
It is unlikely, to me, given the status of this aircraft as a great white hope for the military, by no other group than the US Military, who had time and money to throw at such an ambitious project, that Australian Military agencies with much less clout, knowledge and cash, could do better. Anything man made during this time would (I imagine), be clumsy and not likely to be travelling in groups for fear of collision. It would also not likely be put into the air anywhere near a city such as Moorabbin, if it was a 'secret' design.
Which leaves some interesting assumptions or options to consider...
[*]The craft were not of this earth, and piloted by beings NOT US
[*]The craft were not of this earth, but were piloted by humans, after being 'found' here on earth/shot down and repaired, whatever floats your boat.
[*]The craft were not of this earth, but were piloted by humans, after having been taught how to do so, by the original pilots, in some sort of mutually beneficial arrangement in exchange for something else (not being fired upon by the military when doing their UFO thing here on earth perhaps?)
[*]The craft were not of this earth, but were piloted by humans, after having been taught how to do so, by the original pilots, perhaps against their will
Tin foil hats on everyone! Have a nibble of this magic mushroom! Or just let your mind be boggled by the possibilities... many of which I have not considered or mentioned here. I knew my thing for old aircraft would come in handy one day...