Surface-to-air missile system in "Blue Shield-2017"
A surface-to-air missile system is fired at the simulated target during the "Blue Shield-2017" exercise held by the PLA Air Force in the desert area of the northwest China in early April, 2017. Six ground air-defense brigades and regiments from the air forces under three PLA Theater Commands participated in the ten-day-long exercise. The "Blue Shield" exercise is one of the four key training brands of the PLA Air Force, along with "Red Sword", "Golden Helmet" and "Golden Dart". (81.cn/ Liu Chuan)