ANZAC or Anzac?

[Tony Wheeler]

Originally Posted by Tony Wheeler

Marine
a. a soldier in the Royal Marines
b. a soldier in the US Marine Corps

Of course, they won't see their respective military acronyms in dictionaries

I was wrong, Oxford lists RM and USMC, but Cambridge and Macmillan don't.

It's possible Oxford lists a few of the more commonly used military acronyms which remain current, like these two and NCO. For example they don't list ANZAC or AIF (except as Asociación Internacional de Fomento, which is part of the World Bank).