All the more reason to build a well manned wall. If Israel can man a 400 mile wall with a population of 8 million, then by extrapolation a country of 300 million can conceivably man a wall of a length of 15,000 miles. Tired of the BS.
Israel is exactly the example we need to look at. If anyone thinks their wall is unmanned they’re uninformed. If they think low-tech fence they’re nuts.
In our case the Mexicans aren’t lobbing rockets into cities and infiltrating with suicide bombers or ied planters, but it proves that a fence alone is a dumb idea.
And to monitor 1200 miles of border will take a division at a minimum, and that will cost a billion anyway.
If the force uses high tech FLIR, Motion and sound detection, then a no man’s land will be as effective as a fence
And as Marlowe said, until laws are enforced, the fence is moot. They will just come to visit on a visitors visa, come freely thru the checkpoint, and simply not return south of the border.