[zeveb]

You neglect the possibility of a legal, constitutional order with which one disagrees (neither the law nor the Constitution forbids all bad things). For a member of the civil service, one's choice, then, is to obey or to resign.

For the military, of course, there is no choice: one obeys.

[landryraccoon]

I certainly hope you are wrong about the military. If the generals that lead the military attempt a coup to overthrow the democratically elected government of the US I would expect every loyal soldier to disobey those orders.