No, it's a good idea but it needs the proper armament on the US side. I recommend a 50 cal every 200 yards, regular armed patrols, and the occasional helicopter strafe. Plus nearby forces that can amass in case of a large-scale break-in.
Oh, wonderful. Apparently not content to address the problem at its actual source, which would be cheaper and more effective, you instead to propose a shoot-to-kill policy that would never be enacted in any case.