From my experience, military and civil, on VHF, 'Over' is passing information that will require some kind of acknowledgement, hardly used these days though but "Over" still widely used on HF."Over and Out" is for bad films only!
In the late seventies I was flying with a lot of Australians, a mixture of recently ex military and long time civil. When with one of the recently ex military pilots he asked me why I always read back the pressure setting, I told him that was how it was done in Europe and was mandatory, "Well we don't do it here in Australia" was the reply!
Any thoughts,
Lead Sled and others?