A cluster of transport helicopters attached to an army aviation brigade under the PLA 72nd Group Army hover at an ultra-low altitude over a river during a round-the-clock combat flight training exercise on April 8, 2020. The flight training exercise focused on subjects such as dogfight，stealth assault and defense operation, coordinated night combat flight and so on. (eng.chinamil.com.cn/Photo by Zhang Huanpeng)
Source：China Military Online
