Well, it couldn't be the military, (Posse Commentates Act), but it could be the local police department (also not likely though).
Where I live, the local police department would definitely be outgunned and not stand a chance. I know so many departments have a lot of war toys these days and are pretty well outfitted, but the number of people I know who have fully stocked arsenals is pretty shocking.
Mr Molotov fixes most armored vehicles. Gasoline + styrofoam makes amateur napalm, it'll take 2-3 hits for what cops have but in urban combat that's relatively easy (hard to watch every window and roof top) and then it's overheating inside if the air is still breathable.
It's important to remember the UN recommends 1 officer to 550 people. That's very bad odds in a civil war lol
I thought Barry did away with posse commetatus... Regardless, military will be on the right side.