I do recall seeing a video several years ago of Marines training in the Yuma area on how to round up citizens.
How many marines do you know?
There is no possibility of a civil war with only two factions. There is also no possibility of a war where the military remains unified.
Look at the civil wars in Liberia for a more accurate snapshot of how an American civil war today is likely to go.
Sadly, it very easily go like that recent civil war in the Marshals. After that one was over no building larger than a porta potty remained unburned.
That was training on operating and clearing terrorist strongholds as well as urban warfare.
I am always amazed that so many on this forum believe that the U.S. military ranks and even most of the senior NCOs and officers will blindly follow the orders of the would-be fascist dictators. The swear to uphold the Constitution first and the lawful orders of those appointed above them. A civil war, like the last one would be a violation of the Constitution and unlike the state-centric attitudes of 1860, there is no alliance of contiguous states that are mostly uniform in their support of a single political rally point. The density of dem support is localized in many big cities and the areas near them. A 2nd civil war would be more a confederacy of city-states, surrounded by a mostly non-supportive population. City-states do not command the allegiance of the military, even in CA. They lost then and will lose again. You won’t be rounded up by the military; they will be part of putting down the rebellion.
Ah yes, the undistributed middle rears its ugly head, as in:
[1]All forces used to 'round up' citizens will be military;
[2]All Marines are members of the military;
[3]Therefore, Marines will be used to 'round up' citizens.
No. That is an urban legend. A USMC officer at the war college wrote a scholarly paper on the topic of would Marines operate against civilians.
It never turned into “rounding up civilians” exercises.