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What are the rules for using apostrophes after an acronym that ends in the letter "S"?

For instance, if I have a pretend product called Fast Ice Cream System, or FICS, which delivers ice cream very quickly to wherever you are, I could:

  • Have more than one FICS (would this be written as FICSs, FICS', FICS'S or FICSS)
  • Have a component of the FICS (this would be "the FCIS's flux capacitor)

Is there an appropriate English style guide? I can't imagine this is new territory.

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  • @EdwinAshworth my question is specifically about abbreviations that end in S, it’s not clear to me if the rules differ
    – agentroadkill
    Oct 21, 2021 at 18:37
  • From Pain in the English: << This rule is exactly the same when the acronym in question ends in an S. So you have one ACS, and a thing belonging to it is the ACS's thing. Or you have additional ACSs, and something belonging to the ACSs is the ACSs' thing. ... speedwell2 >> However, the majority view is that abbreviations not pronounced as if single words are initialisms, not acronyms. Thus CIA (and doubtless FICS) is an initialism, NASA (like radar) an acronym
    – Edwin Ashworth
    Oct 22, 2021 at 11:30

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