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I wouldn't go as far as that. IED itself isn't that new concept. During WW2 Japanese used burried arty shells to destroy US tanks. Soviets put explosives on dogs and trained them to run under enemy...

And we shouldn't ignore simple fact of evolution both in material and use/placement. If something works use it. If something doesn't work (or doesn't work anymore) change it or stop using it.

I...

I wonder how much is US military looking in past experiences with such devices. Israel in Lebanon most notably. Why invent hot water when you can use past lesson learned.