U.S. tanks have depleted Uranium "reactive" armor. In essence, the armor explodes outward as the incoming round explodes inward, cancelling the force of the blow. The armor is divided into sections or plates. Once one section is hit, it's reactive capability is spent. If it gets hit again in the same area by an RPG or a mortar, damage will be done.
Let's remember fellas, this is a war. People and vehicles will be lost... However, if you take a tally of coalition losses vs. enemy losses, I think there's a clear picture being painted here... Saddam's days are numbered.