In this video you can see soldiers patrolling the borders with rifles and dogs and using drones to scan the area, what’s your definition of heavily armed?
The clue here is that soldiers typically don’t have dogs - their job is not tracking anyone. The folks you see are probably border guards. (Another clue is that soldiers would be expected to carry at least one proper machine gun per squad, items like grenades and grenade launchers, etc.)
A technical note: they need to sort their communication out earlier, by the midterm congressional election. Apparently, their communication didn’t reach the voters, and voters were in a mood for hearing sweet lies from a criminal oligarch. They need to think of how to change that…
US society needs to somehow withstand 2 years of Trump running loose.
One can also hope that some senators or representatives are old enough to retire (or courageous enough to defect), changing the composition of the Congress before that. That might prevent or slow Trump from steamrolling new laws into force, until something has been figured out.