An unmanned ariel vehicle model is on display during the Unmanned Systems 2013 Exhibition by the Association for Unmanned Vehicle Systems International (AUVSI) in Washington D.C., capital of the United States, Aug. 13, 2013. With more than 8,000 attendees and 550 exhibitors from more than 40 countries, the event showcased the latest development for the unmanned systems. (Xinhua/Zhang Jun)
A model of Boeing's Unmanned Little Bird is displayed during the Unmanned Systems 2013 Exhibition by the Association for Unmanned Vehicle Systems International (AUVSI) in Washington D.C., capital of the United States, Aug. 13, 2013. With more than 8,000 attendees and 550 exhibitors from more than 40 countries, the event showcased the latest development for the unmanned systems. (Xinhua/Zhang Jun)