Z-19 attack helicopters attached to an army aviation brigade under the PLA 80th Group Army lift off successively for a simulated long-distance assault operation on February 24, 2018. (eng.chinamil.com.cn/Photo by Li Qiguang)

Z-19 attack helicopters attached to an army aviation brigade under the PLA 80th Group Army lift off successively for a simulated long-distance assault operation on February 24, 2018. (eng.chinamil.com.cn/Photo by Li Qiguang)

Z-19 attack helicopters attached to an army aviation brigade under the PLA 80th Group Army lift off successively for a simulated long-distance assault operation on February 24, 2018. (eng.chinamil.com.cn/Photo by Li Qiguang)

Two Z-9 attack helicopters attached to an army aviation brigade under the PLA 80th Group Army lift off simultaneously for a simulated long-distance assault operation on February 24, 2018. (eng.chinamil.com.cn/Photo by Li Qiguang)

Two Z-9 attack helicopters attached to an army aviation brigade under the PLA 80th Group Army lift off simultaneously for a simulated long-distance assault operation on February 24, 2018. (eng.chinamil.com.cn/Photo by Li Qiguang)

Pilots assigned to an army aviation brigade under the PLA 80th Group Army fly their WZ-10 attack helicopters in formation at an extremely low altitude during a simulated long-distance assault operation on February 24, 2018. (eng.chinamil.com.cn/Photo by Li Qiguang)

A group of Z-9 attack helicopters attached to an army aviation brigade under the PLA 80th Group Army receive last-minute inspections while hovering at low altitude prior to a simulated long-distance assault operation on February 24, 2018. (eng.chinamil.com.cn/Photo by Li Qiguang)