If something like this was to be done here it should be done for the purpose of providing protection and not to get publicity imho. Local media in my town of Lincoln are enemy propagandists and would spin it to serve their purpose. But doing it to provide protection to those who serve their country would be fine. Just remember it would probably need to be a long term thing, since the dynamics causing the problem seem unlikely to change. And it would probably be best for those doing it to be inconspicuous, though they might want to make themselves known to those inside. How many here would want to make a commitment to do something like that for a long time?
An argument can be made though that if a large group of patriots stood outside every military office carrying guns in the open, in order to provide protection to those disarmed by a corrupt government, that might inspire Congress to use what power it has to improve the situation. Whether it would have that effect is questionable though.