This robot dog was made to save soldiers' lives as US races into new era of autonomous warfare

A four-legged robot dog prowled the floor of the Army's largest annual conference in Washington, D.C., this week. Nearby a handheld weapon promised to knock drones from the sky without firing a shot, and a new interceptor was built to chase down the faster, deadlier versions coming next.The displays offered a glimpse of a battlefield changing at a pace that is forcing the U.S. military and defense industry to race not only to develop new weapons, but to keep them from becoming outdated as quickl