Working staff prepares the trial flight of the mass-production model of China's unmanned aerial vehicle CH-5, or "Caihong (Rainbow) 5", in north China's Hebei Province, July 14, 2017. Introduced at an international airshow in the southern Chinese city of Zhuhai last year, the CH-5 can conduct reconnaissance, surveillance, patrol, target positioning and strike missions, according to its developer. (Xinhua/Bai Guolong)
