I’m not from the US and have no military experience either. So the US has apparently 3 maritime branches in the uniformed services and the Coast Guard is, well guarding the coasts of the US. And the other branches can’t do that?
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The simple answer is “Posse Commitatus” which forbids US federal military to enforce domestic policies in peacetime.
The National Guard (army and airforce) and the Coast Guard is exempt.
[https://en.wikipedia.org/wiki/Posse_Comitatus_Act](https://en.wikipedia.org/wiki/Posse_Comitatus_Act)
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