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Guest post by "Kessy Athena"
The tools of war may change, but war itself really doesn't.  A generation of young men hacked to death by swords is not fundamentally different from a generation blown apart by roadside bombs.  War is and always has been among the most terrible and traumatic things in human experience.  The only thing that's really changed is scale.  Our ability to wage war has become great enough to destroy our entire world.  Which is why we can't keep doing it anymore.

Incidentally, insurgencies are really one of the oldest forms of warfare.  What the US faced in Iraq is very similar to what it faced in Vietnam a generation ago.  Or, for that matter, what the Romans faced in conquering Britain two millennia ago.