You need defense in depth.
Michael Parker

I was never military, so I bow to your superior experience, but from what I’ve learned from years of tabletop and RTS wargaming, what I think we need is more than just static defenses, we need a multi-pronged approach. Case in point, the infamous Maginot line — nice idea, but in practice, totally useless because (1) it only covered one of France’s borders (and the Nazis invaded through France’s undefended borders) and (2) the French relied on a single line of defense instead of layers and mobile forces (cf. “blitzkrieg”, “shock and awe”).

But my original point is that building a giant wall along one or more borders is a huge waste of money, materials, and effort because modern warfare has made static defenses largely obsolete.

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