I know this is outside the normal forum topic range, but I have tried to get an answer on one forum without any success, so I thought .... no harm done if I try on here ..... so ........

Can anyone advise on when Bomber Command / Strike Command crew classifications changed to Non-Operational, Operational, Combat, Senior, Command?

I have a note which says 1966 but I don't know if that is correct. Also, was there a particular reason for the change from Non-Combat, Combat, Combat Star, Select, Select Star?

Any help would be most appreciated