Not all embassys rate Marines. Some of the smaller ones don't get them.
I would think it would be similiar to WWII. Marines who had spent time at the front and say were wounded would get time at an "easy" gig as they recovered. Or similiar assignments as it would be a perk and path to promotion so some folks would end up pulling the duty. Also, a surplus of personel in some units and MOSes could be assigned to the duty.
I mean, per the timeline you can have Marines who are on sea duty. But, they got rid of them in the 90s. And the security forces unit also took a hit as well in the 90s, with places like Adak and Mare Island closing to name a few where they were stationed and trained. But, in the original game history in theory if you did good research on your background it would fit nicely.
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