Maybe it is time to “Send in the Marines!”
Or possibly element of the 101st or 82nd Airborne. Maybe we could have multiple SOF units strategically placed across our southern border (in large numbers).
Possibly co-located or in close proximity to some Predator and Reaper units for intelligence and close air support (silently).
Of course when silence isn’t an issue several support squadrons of CAS aircraft could be near by along with “Puff the Magic Dragon” (couldn’t resit - for some old timers like myself maybe) or an AC-130 or two or three or four.
Keep the border a bit more quiet possibly.