Letters in service numbers
Joined on January 5th 1965 as Craft Apprentice 202nd Entry with no letter, shortly after letters were affixed to service number, however usual cock up as my letter was the letter " O " , promptly used as zero by all and sundry, yet again very shortly changed to " P " and still can't forget the thing, comes in handy for passwords and pin codes on cards!
And old is when you can remember the torqe loading on a Beverly prop securing nut ( 720 lb ft )!, and moving them into a hangar sideways as the fins wouldn't go under the roof if you tried it the normal way, oh what a laugh that was!