If it comes to that, then the war has been lost. No group of patriots, or militia, or whatever you want to call it has jet fighters and tanks. Not to mention satellite surveillance and nukes.
No modern government has been overthrown without significant elements of the military switching sides. In Russia in 1917, the army resorted to using peasant conscripts, who were more sympathetic to the Bolsheviks than their officers. In China, the communists had been part of the WWII effort, and were a de facto part of the military, well-trained and well-equipped. In Russia in 1991, the coup failed because the tankers decided to defend Yeltsin and company at the White House rather than attack them.
If it were to come to that in the US, our best hope would be in the Reserves and the National Guard -- folks who don't live in the isolated world of the military, but with and among us. If ordered to fire on an unruly crowd of their neighbors, they would be less inclined to shoot the crowd than to shoot the officer giving the order.
There has also never been a nation armed to the teeth with literally uncounted millions of scoped deer rifles capable of “minute of man” at 500+ yards. Never.
In some ways it’s easier to occupy Iraq, than it would be for our military to enforce a tyranny here in the USA.
In Iraq, our forces live in protected firebases. THeir families are thousands of miles away, safe at home in America.
If the military tried to stamp out a hypothetical insurgency here in the USA, it would get very messy. THose troops have homes and dependents mingled among the population they would be trying to suppress. THey can’t live buttoned up inside of tanks and APCs.
It would get old, living “on base” 24.7, afraid to go to the shopping mall, or the civilian golf course etc. It would be a long walk in the open across the parking lot at Walmart for the off-duty State Security goon.
I sincerely hope we never have the opportunity to test either sides of that equation.