Here is one reference to USA phonetics with transition dates -
https://www.history.navy.mil/researc...nal-flags.html
I learned the still current NATO/ICAO standard back in my late teens in the UK CCF. I do still remember the first radio amateur I heard on my crystal set. He was "george two fox queen pacific". I tracked him down and he helped me on my way to my unresticted G3 call.