Two helicopters attached to an army aviation brigade under the PLA 74th Group Army fly in formation during a flight training exercise involving multiple types of helicopters on September 1, which aims to hone the flight skills of pilots.Photo:China Military

Two helicopters attached to an army aviation brigade under the PLA 74th Group Army fly in formation during a flight training exercise involving multiple types of helicopters on September 1, which aims to hone the flight skills of pilots.Photo:China Military