I don't think people realize how fantastically destructive the US army could be on a civilian resistance. It would be an absolute slaughter with mid air bursting rounds killing and entire room full of people once they breach a window.
Drone surveillance with no where to run or hide. Complete air superiority. Death would rain down constantly. The weapons of war are truly perverse. Think of the horror of cluster bombs with thousands of bomblets going off at once and hundreds later on for the next ten years randomly killing and maiming people.
To even suggest such horrors is beyond disgusting yet we have a President gleefully suggesting turning the army on his fellow countrymen.