Violence?

[BigElCat]

I've seen Valkyrie and have read a bunch of stuff about WW2.

That was actually a small uprising and it was squashed quickly.

Look into the Soviet Revolution, starting in 1905. The Red vs the White Russians. Military divisions did split along political lines.

But that was different. The Reds had an ideological difference, something to fight about. Just because 40% of the military supports Trump, that doesn't mean they're going to fight the other 60%. Trump is their boss, the Commander in Chief. Of course they say they're going to support him. It doesn't mean the other 60% are refusing to follow the chain of command. It means they won't vote for him in the next election.