More hyperbole....
I'd say that if there were a second Civil War, the Red States probably wouldn't need tanks. Just look at how well our politician led military fared in Afghanistan, Iraq, and Viet Nam against insurgents.
Those insurgents didn't need to stop the tanks. They went after the supply convoys...
Just for gits and shiggles, let's look at some raw numbers.
There are around 700,000 active duty foot soldiers between the Army and the Marines plus special forces from the Navy. The rest of the Navy and the Air Force really aren't geared to do much when it comes to defending the interior of the US... They can guard their bases, and I guess they could bomb/shell civilians, but in total, they really aren't going to be that useful defending a city.
There are 300 million firearms owned by Americans, of which around 10M are estimated to be AR-15's.
Citizens with AR's already outgun the military by 10 times. Throw in other types of firearms, and it's 30 times the military's foot soldiers.
Now, how do you think that imbalance would work?....