“Some will refuse, and they will be dealt with, harshly. Most will follow orders.”
Tell everyone here how you know this with such certainty.
I don't know it with certainty, but I believe it, and nothing you tell me will persuade me otherwise. Troops will do what they are told. "Cop mentality." see disarming civilians after Katrina, Kent State, etc. The environment will be hostile, and everybody acts differently then.
Historically, Whiskey Rebellion.