Tanker aircraft taxi on the runway successively during the "Red Sword-2018" systemic confrontation training exercise held by the Chinese PLA Air Force in northwestern China's deep desert in early June, 2018. The "Red Sword-2018", involving various troops from the Air Force, such as aviation, ground-to-air missile, radar, electronic countermeasure troops, aims to beef up the Air Force's systematic combat capabilities. (eng.chinamil.com.cn/ Photo by Wen Zhijun)
