From people who work in the military and government, yes. In random internet forums all across the internet, for several decades now, much of which is difficult to find now. There are remnant screen shots you may find of some of the conversations, but it's difficult to find through normal search engines.

In any case, it's public knowledge that the U.S. government, through the military (especially in the war colleges), run war game scenarios of various flavors all the time, to "prepare the troops for possible scenarios". What's not widely publicized is the civil war/revolutionary war 2.0 scenarios they run, because of how they always end up.

This is one of the reasons why the U.S. government is so hellbent on cracking down on any White dissident groups capable of violence, or who separate themselves from the government, or try to resist the tyranny. The government always responds as quickly and maliciously as possible, with abhorrent and illegal actions, like murdering people. Such incidents include Ruby Ridge, Waco, and the Oregon Wildlife Refuge standoff in 2016.

They do this because it's their only play, to prevent the violence from escalating and spreading. Once the violence spreads, they don't have the manpower to stop it. The government is very good at applying focused violence at specific individuals and groups, but once it grows too widely, they can't stop it. There are simply too many people, spread across too much land, to police, fight, and stomp on. So, they try to stop it as vociferously as possible at the inception. It's all vain, though. We're going to collapse anyway, and the violence will spread regardless.