The patient had been shot on the streets of Chicago, but when Dr. Jared Bernard stood over his open body in the operating room, he could see that the single bullet had unleashed the same kind of massive infection inflicted by roadside bombs in Afghanistan. Although the wounded man lay in a modern American hospital, saving his life would be no different than caring for a soldier wounded by a bomb exploding under a Humvee. That's why the Navy is sending its doctors, nurses and medics to Stroger Hospital, a Cook County facility that, in its own way, stands in the middle of a war zone.