I left 9 years ago from the BZN fleet. A couple of years later a flight test crew arrived, most of which I knew. One member was a master when I knew him but was now a Sqn Ldr. Out of the mob now, but still thinking RAF I called him 'Sir'! When he told me not to be so regimented I began to talk on a more friendly basis. My, Totally MOD, bosses did their nut
They could not understand the 'crew' mentality. I was a GE and do miss that relationship but I am lucky, I still meet some of my ex-crewmates.
Hope everything goes well, whatever your next career is but cherish the times when you were in.