ANZAC or Anzac?

[Marc Montgomery]

NATO is spoken like a word, there's even a Nato Beach.. but its never been spelled Nato. There was USAAF, and is USAF.. but not USaf. even though it either could be pronounced like a word.
NORAD is never Norad, even though it originally stood for Nor(th american)Air Defence, which could theoretically be lower cases as each letter does not stand for a word...(NorAD) or in Canadian Press guidelines-could -theoretically be written Norad.. but it never is.

As for dictionaries being the ultimate...when they start adding "fad" words like twerking (in five years no one will know what that means...or care thank goodness) then they've lost their authority in my mind.
It remains ANZAC to me, because it follows several English language rules.

Remember the brave Chocos ! (even a Canuck knows)