Two military helicopters attached to an army aviation brigade under the PLA 72nd Group Army fly at an ultralow altitude in the tactical penetration flight training on March 22, 2022. Photo: China Military

Two military helicopters attached to an army aviation brigade under the PLA 72nd Group Army fly at an ultralow altitude in the valley for a penetration mission in the tactical flight training on March 22, 2022. Photo: China Military

Helicopters attached to an army aviation brigade under the PLA 72nd Group Army conduct an ultralow-altitude penetration mission in the tactical flight training on March 22, 2022. Photo: China Military