Military members take an oath to defend the Constitution of the United States against all enemies foreign and domestic. Any order given to any military member that calls for the engagement against a private citizen on American soil is an illegal order and would require that service member to turn weapons against whomever is giving said order.
It is absolutely a requirement for active duty military members to resist tyranny. There is no question about this. Following illegal orders is a violation of military law that would subject service members to Courts Martial discipline with penalty up to and including death depending upon the offense.
The President of the United States with support of the liberal media and hysterical people on the left apparently believes that he has control of the armed forces and thus the ability to remove private property by his personal declaration and via force. This nation may be heading down a dark pathway led by an evil man who intends to be a dictator. The fight is not done with today's little speech. It is only beginning.