Ah Ha, at Kuantan in 1965, I was issued with an Orlikon 20mm cannon - one of only six deployed on the station (all in a straight line beside the runway).
I was trained on this thing and thought good stuff - come on Indonesian air force - make my day!!!!
Then we had an exercise and I was to discover that there were only five 'pans' of ammo and for this exercise my gun and crew weren't 'served'.
Old Duffer