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everything you want is literally in the first return.
<it is history.
<<look it up.
<<<lazy idiot
https://duckduckgo.com/?q=The+Marines+are+the+only+branch+of+service+that+falls+directly+under+executive+command&ia=web
https://www.quora.com/Why-are-the-Marines-the-only-branch-shown-to-guard-the-President