Of the 6 US services only two share enlisted ranks names, Navy and
Coast Guard and I'm not 100% sure on that..  The Army, Maries, Air
Force and Space Force share officer ranks.  The Navy and the Coast
Guard share Officer ranks.

On Mon, May 20, 2024 at 11:12 AM Jeff Zeitlin - editor at
freelancetraveller.com (via tml list) <xxxxxx@simplelists.com> wrote:
>
> For some reason, almost universally on Earth, national defense services
> have at least two and occasionally more sets of rank titles. Often, the
> same names are used for ranks at differing levels of the hierarchies of
> different services, and in at least one language, there is a term that
> indicates an assignment that may not be held by a person who is entitled to
> use that same term as rank.
>
> Even national services that notionally are unitary still maintain different
> sets of rank titles for differing components.
>
> Canonically, this differentiation extends to the Imperium itself. Should
> it? If not, what should be the unified table of ranks? (Ideally, there will
> not be any rank title that is also used by persons of other rank in a
> specified position.)
>
>
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> --
> Jeff Zeitlin, Editor
> Freelance Traveller
>     The Electronic Fan-Supported Traveller® Resource
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--
Some of us have a little bit of Crazy and some of us have a 40,000 liter
drum filled to the brim of the stuff - and you don't know how much Crazy
there is until it's awake - by which time it's waaaay too late to try
and cram it back in the box. -- Simon the BOFH