And my experience serving over 20-yrs in the military and over a decade in the defense industry, no one in the military would fire on US citizens.
I can fully understand why you believe that to be true, but the thing is there has not yet been a situation in this country where law enforcement and/or military personnel have been commanded to do so. Although some would say that there have been incidents in the history of race relations involving blacks and native Americans, and also incidents during times of war that are at odds with your contention.