Over the past four years, the U.S. armed forces, the most efficient, best trained and best equipped in the world and invincible against huge regular armies, have learned the same sobering lesson in the Iraq war. No one factored into the equation improvised explosive devices as a serious tactical weapon of war before the current conflict, but IEDs have completely changed the strategic equation in Iraq. And as last July's brief war in southern Lebanon demonstrated, Hezbollah, the Iranian-backed Shiite Party of God, had learned the lesson well enough to inflict unexpected casualties on Israeli Merkava Main Battle Tanks.
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