Colorado supreme court ruled that they can take Trump off the ballot, now it looks like California is trying to do that as well. Meanwhile, republican states are threatening to retaliate in kind.
This seems unprecedented for US, does anybody know what happens in this scenario?
I don't know, the regular forces are as you describe but the various state national guard units seem like a real mixed bag. I could see some of them going along with their governor in a balkaniation-type scenario
A conscript who works 5 days a week at Enterprise Rent-A-Car or Walmart is hardly on the same level of a US Marine.
They would be garrison troops at best, or military police. They would be slaughtered in any actual combat, as they were in Iraq.