A fighter jet attached to an air force base under the PLA Southern Theater Command taxis on the runway of a military airport in south China before takeoff for a joint training exercise involving multi-type fighter jets on May 14, 2021. (eng.chinamil.com.cn/Photo by Fan Yishu)

A fighter jet attached to an air force base under the PLA Southern Theater Command taxis on the runway of a military airport in south China before takeoff for a joint training exercise involving multi-type fighter jets on May 14, 2021. (eng.chinamil.com.cn/Photo by Fan Yishu)

A fighter jet attached to an air force base under the PLA Southern Theater Command taxis on the runway of a military airport in south China before takeoff for a joint training exercise involving multi-type fighter jets on May 14, 2021. (eng.chinamil.com.cn/Photo by Fan Yishu)

A fighter jet attached to an air force base under the PLA Southern Theater Command taxis on the runway of a military airport in south China before takeoff for a joint training exercise involving multi-type fighter jets on May 14, 2021. (eng.chinamil.com.cn/Photo by Fan Yishu)

A fighter jet attached to an air force base under the PLA Southern Theater Command taxis on the runway of a military airport in south China before takeoff for a joint training exercise involving multi-type fighter jets on May 14, 2021. (eng.chinamil.com.cn/Photo by Fan Yishu)

Ground crews assigned to an air force base under the PLA Southern Theater Command carry the bombs out of the warehouse during a joint training exercise involving multi-type fighter jets on May 14, 2021. (eng.chinamil.com.cn/Photo by Luan Cheng )