It would make for a heck of a civil war. I think you’re correct, as the military took sides, there would be a very, very sharp racial divide.
Winston Churchill said several times that “if you are not liberal at 20 you have no heart - but - if you are not conservative at 40 you have no brain. The military mirrors that.
https://www.quora.com/Why-is-the-American-military-overwhelmingly-conservative