Okay, so we don't get confused with District Attorneys, but people think my job title is "Doing Business As". Not much of an improvement. :-)
But there are lots of cases for including a sub-word in an accronym or initialism. Just like you sometimes leave out minor words, like "of", (FBI, USA) and sometimes keep them in (SCOTUS, POTUS). It's kind of like how you capitalize the "D" in "MacDonald". It doesn't have to make sense, it just has to be accepted.
- Gus "GSquared", RSVP, OODA, MAP, NMVP, FAQ, SAT, SQL, DNA, RNA, UOI, IOU, AM, PM, AD, BC, BCE, USA, UN, CF, ROFL, LOL, ETC
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"Nobody knows the age of the human race, but everyone agrees it's old enough to know better." - Anon