Precisely, but we need not *ignore* the laws- once they have been so abrogated, the constitutional contract between government and governed is thereby dissolved without further process, and any laws derived thereby are also moot and without any real moral authority or backing- and Article II of the Constitution is just as meaningless as the Second Amendment- and the authority and offices under that Article are equally null and void.
Finland suffered similar difficulties between the pro-communists and *white* forces during their 1918 Civil War. It is not difficult to foresee something similar here in the near future, but note that once the Constitution is abandoned, it cannot be repaired or replaced by simply patching over the flaw that caused its initial disintegration.
As for how former Marines as yourself might fare in such a post-constitutional aftermath, see Robert Heinlein's novel Starship Troopers.