Well, 16 years ago when I retired officers and enlisted were both trained in the laws of war and in what constitutes a lawful order. This is not to say there are not some senior officers who would try to act on an unlawful order; putting their career advancement over the right thing to do but overall today’s military are a lot more aware than in past times. Unlike what the democrat party would like everyone to believe, the average military member is not an ignorant robot followers.
If 0bama wanted to institute martial law, or use military troops in some other way against civilians, which officers do you think would be selected to carry out his orders? Would he pick a General Petraeus type or a Wesley Clark type?