"Wilbur Hubbard" wrote
The NUC class consists of vessels that may or may not move in and out of
the class.

Other than coming up with some stunningly insipid ad hominems, you're just
not doing a very good job here, Wilbur. With your characteristic dearth of
brevity, you've amply explained that a class, as you define it, is a
temporary condition that any vessel (or human) can enter or leave. The
problem isn't with your explanation, it's that there's just no sensible way
to square it with your earlier assertion that another temporary condition,
overtaking, doesn't fit your definition of a class. What you fail to
recognize, is that I haven't called into question your position on what
should or shouldn't be included in the mnemonic, I've only pointed out that
your argument against the inclusion in question is specious at best. Perhaps
if you spent a little less time pontificating, you could do a better job of
explaining yourself.

You, sir, are a dunce!

You, sir, have no class...