Chimbu,
It was very much SOP, and strongly encouraged by the leadership (to the extent that they closed the international airport after the National Day flypast to allow it to go ahead).
Speaking as a heli driver at the time the vids were being produced, I can aver that the standard operating altitude for rotary was 50 ft and below. Everything above that belonged to the fixed wing and the artillery. Happy memories of being taken for 1v1 and 1v2 in Troff Jones' T-bird Hunter against UAE Mirages, then later off down the Grand Canyon. Mind you, we used to get our own back by flying the stovies off into the caves...
Pleasant days