tmmorris - 1977.
We first met when we entered the mess, sat down and ordered lunch. The waitress served us and retreated behind the counter. Shortly afterwards, the GSM marched into the room with all the other SNCOs following in single file, in rank order. GSM comes over to our table "Ah! You must be Royal Air Force!" "Yes, sir!" Says we, standing up. Without another word, he marches to his place, the other Sergeants go to theirs, the GSM sits, everyone else sits.
We got the message and brought up the rear for the rest of our sojourn. He was a great storyteller in the bar on an evening.