The Posse Comitatus Act was intended to prevent the use of federal troops in the sovreign states to enforce ordinary civil law. It does not apply in Washington DC as it is not a state, even though there has been a reluctance to do so.
Recall the images of US Army Military Police during the Vietnam anti-war demonstrations at the Pentagon.
18 U.S.C. § 1385. Use of Army and Air Force as posse comitatus
Whoever, except in cases and under circumstances expressly authorized by the Constitution or Act of Congress, willfully uses any part of the Army or the Air Force as a posse comitatus or otherwise to execute the laws shall be fined under this title or imprisoned not more than two years, or both.
Guards do not enforce law. a fine line I admit but still a line.
Actually I-495 is mostly not in DC. It is mostly in VA and MD. I-395 is mostly in DC.
Posse Comitatus?
What makes anyone think that O’B will obey any of our laws, his unicorns and
skittles promises during his campaigns, or his oath of office?
So far, his track record says “NO” loud and clear.