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You don't ever use apostrophes to form plurals, so that's right out. If the Roman numeral is part of the name, you would add an S: A total of 15 Saturn Vs were built, but only 13 were flown. If ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/28433 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/28433 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
You don't ever use apostrophes to form plurals, so that's right out. If the Roman numeral is part of the name, you would add an S: _A total of 15 Saturn Vs were built, but only 13 were flown._ If you have two people sharing a title, you pluralize the title (the Doctors Smith, the Ensigns Kim). But if the Roman numeral is fused to the title giving information about the level, then the entire title is _Validation Engineer II_ (singular) and you pluralize the entire unit as **Validation Engineer IIs.** In law school you talk about 1Ls and 3Ls (for first-year and third-year students). If engineering is the same way, you could call them **VE IIs** to sound less awkward.