Found it! Here's an example from the current regulation on correspondence from the Army (AR 25-50):
(11) Army National Guard personnel not on active duty will use the two-letter State or territory abbreviation of their
unit followed by “ARNG,” for example, KSARNG (Kansas Army National Guard personnel).
Isn't this what we are discussing? Under British rules, the comma following the acronym ARNG would be outside of the quotes, not inside, right? The Army, however, does it this way. (Note that of course with parenthesis the "British" way always applies -- in the paragraph above, the punctuation is outside of the parenthesis because it is the end of the sentence, and what is inside the parenthesis is not the whole sentence.)
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