Multiple transport helicopters attached to an army aviation brigade under the PLA Xizang Military Command hover above the Potala Palace and the vicinity of the Lhasa City during a recent round-the-clock flight training exercise in southwest China's Xizang Autonomous Region. (eng.chinamil.com.cn/Photo by Pu Jin, Lu Jian, Wu Guolong and Bai Qi)
Source：China Military Online
