Mine the border. Have the mines remitely controlled on/off. Activate 1/10th if them randomly. Nobody coming across will know if they are active or not. Sort of like concealed carry mines. A couple ILLEGALS get blown up, then nobody else chances it. You don’t need 15000 troops, just one guy with a switchboard.
“Mine the border”
My brother and I recently invented a cheap, non-explosive mine . It’s electrical, charged by solar cells, can be turned on or off remotely and can be remotely set for from stun to kill. It would be nice to have the business...