Re: Is saying "it has been an honour to serve with you" naval traditio
It's probably not an explicit tradition, but rather good manners and good sense.
In much the same as you'd say "been good working for you, best of luck in your new job" when someone leaves your workplace. One never knows when one'll have to work with that person again, or will try to get a job for them - always a good idea to leave on a cordial setting.
Plus people in StarTrek are always exceptional, so it *would* be an honour to serve with them.
dJE