MRAPS weigh more than 40,000 pounds, cost about $600,000 a vehicle, and are designed explicitly for the unpredictability of modern warfare. When an MRAP sets off a roadside mine, its v-shaped underbelly deflects the blast away from the troops riding inside. Roadside bombs are used primarily by insurgencies, so MRAPs are useful when the U.S. is fighting insurgents, but the vehicles don't have much use beyond that. The United States has more than 20,000 scattered around the world, and the Pentagon plans on bringing some home. (Many are also being scrapped and abandonded in Afghanistan, because it's cheaper than shipping them.)