The US Military are not sworn to obey all orders, lawful or otherwise. They are sworn to obey lawful orders and to uphold and defend the constitution. If some president were ever to set himself up as dictator, and the American People rightly rebelled, I am confident that the military would side with the people. If, on the other hand, a group of our citizens rebel because they can’t prevail at the ballot box and they think they are so right that they feel they are justified in defying the majority and taking “their” country back through force of arms, I would fully expect the National Guard to defend constitutional law. If we had to temporarily suspend posse-commits and deploy regular military forces in the streets, I believe they too would defend constitutional law.