A convoy of military vehicles carrying PHL-03 multiple launch rocket systems moves forward in formation during a maneuver training exercise in northwestern China's Gobi Desert on June 29, 2018. They are attached to a brigade under the PLA 73rd Group Army. (eng.chinamil.com.cn/Photo by Chen Kunfeng)

A convoy of military vehicles carrying PHL-03 multiple launch rocket systems moves forward in formation during a maneuver training exercise in northwestern China's Gobi Desert on June 29, 2018. They are attached to a brigade under the PLA 73rd Group Army. (eng.chinamil.com.cn/Photo by Chen Kunfeng)

A convoy of military vehicles carrying PHL-03 multiple launch rocket systems moves forward in formation during a maneuver training exercise in northwestern China's Gobi Desert on June 29, 2018. They are attached to a brigade under the PLA 73rd Group Army. (eng.chinamil.com.cn/Photo by Chen Kunfeng)

A convoy of military vehicles carrying PHL-03 multiple launch rocket systems moves forward in formation during a maneuver training exercise in northwestern China's Gobi Desert on June 29, 2018. They are attached to a brigade under the PLA 73rd Group Army. (eng.chinamil.com.cn/Photo by Chen Kunfeng)

Soldiers assigned to a brigade under the PLA 73rd Group Army prepare PHL-03 multiple launch rocket systems during a live-fire operation in northwestern China's Gobi Desert on June 29, 2018. (eng.chinamil.com.cn/Photo by Chen Kunfeng)

Soldiers assigned to a brigade under the PLA 73rd Group Army prepare PHL-03 multiple launch rocket systems during a live-fire operation in northwestern China's Gobi Desert on June 29, 2018. (eng.chinamil.com.cn/Photo by Chen Kunfeng)