From Radley Balko:

A camera trained on the window captures hundreds of MRAPs — rows and rows and rows of them — scrolling by, all destined for a police agency somewhere in America. Meanwhile, an Army specialist explains how the troops who use the vehicles get hours and hours of training before they’re entrusted to drive the trucks on a battlefield. The Pentagon then gives the trucks to police agencies to use on U.S. streets with no accompanying training at all. Sometimes, the specialist says, a police agency will find a body part in one of the trucks. They try to avoid that. But after all, these are machines of war.