Helicopters in the flag-guarding air echelon take part in a military parade celebrating the 70th founding anniversary of the People's Republic of China (PRC) in Beijing, capital of China, Oct. 1, 2019. (Xinhua/Han Mingkun)
Helicopters in the flag-guarding air echelon take part in a military parade celebrating the 70th founding anniversary of the People's Republic of China (PRC) in Beijing, capital of China, Oct. 1, 2019. (Xinhua/Han Mingkun)
