It is different type of war and require different tactics. The Germans lost hundred of thousands of troops in the partisans resistance war in Russia and Yugoslavia and the "Partisans" tactics were not as sophisticated as the tactics that the terrorists are using and they did not have the weapons that the terrorists have in particular those lethal and advanced IED's. That is why I call it an incredible and miraculous success that in almost 4 years we only lost 3,000 thousands of our brave heroes, and all this is attributed to the bravery and incredible professionalism of our military.
Its mostly police work in Iraq.
Raid a mud hut, take weapons, and arrest the men.
And the Iraqi Army is being trained to take over.
Plus the culture, causes a lot of heartburn, the Arabs have trouble with Logic and the truth.