May have been after your time. NEC = Navy Enlisted Classification, and it's a four-digit number that narrows down exactly what you do. Guess they decided that sending a guy from an F-14 squadron to work on an F-18 was NOT A Good Thing :o)
None the less ... I was an AME-3 Worked ejection seats LOX crew (fun stuff) and wore a green shirt on the flight deck.
Remember the movie "The Man From LOX?"
BTW, I recently ran into a guy claiming that he'd been in "the 'Nam" who was only a few years older than me, so he was WAY too late.
I told him "The only 'Nam you were ever in was NAMTRAGRUDET." </obscure NAVAIR humor>