Multi-type attack and transport helicopters attached to an army aviation brigade under the PLA 72nd Group Army hover over city and mountains during a tactical flight training exercise on December 16, 2020. (eng.chinamil.com.cn/Photo by Sun Mingjian)

Multi-type attack and transport helicopters attached to an army aviation brigade under the PLA 72nd Group Army hover over city and mountains during a tactical flight training exercise on December 16, 2020. (eng.chinamil.com.cn/Photo by Sun Mingjian)

Multi-type attack and transport helicopters attached to an army aviation brigade under the PLA 72nd Group Army hover over city and mountains during a tactical flight training exercise on December 16, 2020. (eng.chinamil.com.cn/Photo by Sun Mingjian)

Multi-type attack and transport helicopters attached to an army aviation brigade under the PLA 72nd Group Army hover over city and mountains during a tactical flight training exercise on December 16, 2020. (eng.chinamil.com.cn/Photo by Sun Mingjian)