It’s been proven in previous conflicts that a woman or child would kill one of our troops just as well as a hardened soldier would.
It’s also proven that the enemy uses women and children as human shields in order to negate any advantage we may have.
I found this quote conveniently placed on your homepage.
“Democratic nations must try to find ways to starve the terrorist and the hijacker of the oxygen of publicity on which they depend. “ - Margaret Thatcher
Means and methods are far above my pay grade.
That said, my first thought would be a HUGE, deep phalanx of US troops, UNARMED. Wearing face masks and NO name tags.
You’re a Cavalry guy, it is said that Cavalry, properly used is a terror weapon against unmounted troops.
I believe that a strong show of force would discourage most.
Yes, a nice wall would be best, but a human wall could work. And of course, the entire border would have to remain closed for the duration, any imports from Mexico would have to be VERY closely inspected...What a shame about all the fruit rotting...