The military (Army) is increasingly composed of minority and foreign persons who have little or no knowledge of the Constitution. They will undoubtably take arms against the citizens. We can only hope that the officers that lead them are loyal to the Constitution. The only other consolation is that there are more of us than them and as long as we are armed they had better fear us.
You've just mentioned a reality the citizens of the US had better awaken to. IMO, we should not allow persons who are not US citizens to serve in the Armed forces, and Constitutional rights should be a mandatory subject for high school graduates just like math.