I will add this, re the 2A and its preservation, speaking from the standpoint of a former unit commander in the Army Reserve:

Back after the shootings took place in TN--recruiting office and Reserve Center--some well-intentioned "volunteer guards" started showing up outside recruiting centers. On at least one other BB, some people thought that sounded like a great idea--since it is Dept of Defense policy that military personnel in recruiting offices be unarmed. (Note: The law that makes it illegal to carry weapons in federal facilities specifically exempts military personnel, and in fact all federal employees. It's the screwball DoD policy that leaves them unarmed, not the law. Here in Iowa, the governor took immediate steps to rectify that problem where the National Guard was concerned.)

We do have to be somewhat cautious when it comes to how we exercise our rights. For example, especially if there'd just been a shooting at a Reserve facility--especially in my city--and if I were inside, unarmed without access to our military weapons (locked in an arms room controlled by another unit that isn't present)--I would immediately dial 911 and request that the police respond to armed strangers near my building. How do I know who you are? You could be part of the problem--bad guys pretending to be good guys--and trying to get access to the building or to my soldiers. The intentions of those "volunteer guards" may have been good, but unless the military knows what's going on, they might have been viewed as part of the problem rather than a solution.