Dude, it was easy to spot by what you thought "modern war" was like. What I say plagues even the Pentagon where most commanders assume the last big war plus recent tech trends equal "modern war." Also, most army commanders don't know a thing about strategic theory.

But an interesting point is that nuclear deterrence prevents major formalized governments from seeking conventional war, but there are many states that could breakup or spontaneously unify at any moment. There are also many points in history where large rogue armies sprung up overnight, and internal wars in countries where the conventional forces are either unable or unwilling to act, and extended periods when governments were defunct. You should not think all war is confined to conventional arms or insurrectionists.