Looking at the role Marines tradtionally play in a navy, Starfleet security seems to manage most of them, really the only thing Marines do that SFS doesn’t explictly do is “amphibious assault” and one could perhaps question if you need a branch entirely devoted to “We train really hard to come out of shuttles shooting our phasers” especially when you consider that starfleet is largely defensive and proably rarely conducts offensive operations, and by the dominion war hadn’t fought a MAJOR war in over 100 years. Basicly before the dominion war the last major major war the UFP seems to have fought was the Klingon-Federation war of the 2250s. all the other conflicts in between seem to have been brush fire wars. So when you examine facts a dedicated starfleet marine service seems… unnesscary and thus likely never was created
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