When saying acronyms out loud, almost always the last syllable is accented (no matter how long the acronym is): US*A*, U*N*, RSV*P*, etc.
Accenting any syllable but the last makes you sound silly (try it). Why is this the case?
The way I hear these and pronounce them myself, I'd surmise that the accent is an end-marker.
Your examples are all properly and idiomatically called abbreviations or initialisms, not acronyms, despite what the dictionary says: There's disagreement about the terminology, as is often the case, no matter what the topic. acronym: a word (as NATO, radar, or laser) formed from the initial letter or letters of each of the successive parts or major parts of a compound term; also : an abbreviation (as FBI) formed from initial letters : initialism. An article on this topic appears in Wikipedia: see the bottom of the article for the world's longest acronym:
and the world's longest initialism:
I can't find any explanation on the Net, but it seems to me, as Kris commented, that stressing the final letter is an "end marker": The abbreviation's over now, folks.
However, I can imagine someone in Waycross, Georgia, stressing the first letter in UN, just as they stress the first syllable of the word insurance. Can anyone from that neck of the woods chime in on that possibility?
I don't agree with your observation.
I have heard not too infrequently,
Therefore, your observation is not accurate.
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