Mi-171 transport helicopters fly in formation

Editor：Li Jiayao Time：2021-02-25 21:52:15

Mi-171 transport helicopters attached to an army aviation brigade under the PLA 72nd Group Army fly in formation during a flight training exercise on Feb.20, 2021. (eng.chinamil.com.cn/Photo by Zhang Huanpeng)

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Source：China Military Online