Not at all, the first NSC I came across was a Second Engineer, it was a generic term and not department specific.
In my mind you are a little too quick in attaching "Derogatory" to witty and harmless sayings.
Sorry about that ER, must be my inborn sensitivity stemming from my origins, a mining family in Mountain Ash on my mother's side and from North Wales Millwright Great, Great Grandfather on my Londoner Dad's side .
Sorry, black and white is very non PC. You mean monochrome. As in the Monochrome Minstrel Show.I have a vague recollection of BBC TV showing, in the black and white days, a professional boxing show from Mountain Ash.
Sometimes I feel too old to be posting on a young mans blog.