In a full constitutional meltdown scenario the current Federal Standing Army is not a factor. It will dissolve as states form militias etc. Rioting in major cities will have to be quelled too. Most of the Federales equipment is deployed overseas anyway right now. I can’t see giving orders to guys in Afghanistan to break off fly home and kill your fellow Americans. I see alot of throw down in this scenario (except for a few hard core types).
Indeed. Any rioting by the usual opportunist miscreants would cause further dissension/desertion in the Mordor ranks as local LEOs stay home to protect their own. A collapse of society/services in major cities would exacerbate that chaos and erode Regime support as the dependent class of society seeks to be taken care of, not fight.