An air echelon of refueling aircrafts takes part in a grand military parade celebrating the 70th founding anniversary of the People's Republic of China in Beijing, capital of China, Oct. 1, 2019. (Xinhua/Li Gang)
An air echelon of refueling aircrafts takes part in a grand military parade celebrating the 70th founding anniversary of the People's Republic of China in Beijing, capital of China, Oct. 1, 2019. (Xinhua/Li Gang)
