Military robots

The number of flying robots in the American armed forces' arsenal has gone up by nearly 1400% in four years, military documents show. A relatively modest unmanned fleet of 217 machines has grown into a 3211-drone armada. The most popular of these UAVs in the Army's three-foot-long Raven which has a typical Air Time of 80 minutes and maximum altitude of 1,000 feet. Watch Raven in the New Air Force Commercial video.