Ground crews assigned to an army aviation brigade under the PLA Xizang Military Command prepare to perform inspections on a transport helicopter during a recent round-the-clock flight training exercise at the elevation of 3,700 meters 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
