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Posse Comitatus Act basically rules out any domestic use of the armed forces
Its text only specifies the Army and Air Force. The Navy, its Marine Corps, the Coastguard, Homeland, Prisons Service, FBI, BATF, DEA and Space Force are all federal agencies (edit- not all are technically ‘agencies’) with military or paramilitary capabilities, and aren’t subject to the PCA. They have their own regulations though.
Posse Comitatus Act basically rules out any domestic use of the armed forces anyhow; states would have to request it, and given as how e.g. the Texas challenge was laughed out of court, there's zero basis for that.