This is a rarer set of these 'Half Wings' which are the smaller chrome variant as would have been worn on Mess Dress.

These were the chaps whose job it was to trail targets behind C 130 Aircraft for A A Gunners to shoot at. So they had quite a responsible job.
"Quartermaster's Comment":- A hunt through Owen gives you quite a few 'Variants' of this badge. This one, a smaller variety, in chromed metal would have almost certainly been worn by an officer in Mess Dress.