Answer: Yes Foreign and Domestic
The Marines are called “The President’s Own” force, and of course they guard the White House.
Ditto Army’s Delta Force.
Wow. I didn’t know that. Thank you. I knew they guarded the WH and the embassies. Which come to think of it, is US soil.
The Marines are no different than any other military service when it comes to their relationship to the CIC. There is no special relationship.