A J-10 fighter jet attached to an aviation brigade of the air force under the PLA Northern Theater Command flies through the valley during a recent aerial combat sortie. (Photo: eng.chinamil.com.cn)

A J-10 fighter jet attached to an aviation brigade of the air force under the PLA Northern Theater Command flies through the valley during a recent aerial combat sortie. (Photo: eng.chinamil.com.cn)

A J-10 fighter jet attached to an aviation brigade of the air force under the PLA Northern Theater Command flies through the valley during a recent aerial combat sortie. (Photo: eng.chinamil.com.cn)

A J-10 fighter jet attached to an aviation brigade of the air force under the PLA Northern Theater Command flies through the valley during a recent aerial combat sortie. (Photo: eng.chinamil.com.cn)

A J-10 fighter jet attached to an aviation brigade of the air force under the PLA Northern Theater Command flies through the valley during a recent aerial combat sortie. (Photo: eng.chinamil.com.cn)

A J-10 fighter jet attached to an aviation brigade of the air force under the PLA Northern Theater Command flies through the valley during a recent aerial combat sortie. (Photo: eng.chinamil.com.cn)

A J-10 fighter jet attached to an aviation brigade of the air force under the PLA Northern Theater Command flies through the valley during a recent aerial combat sortie. (Photo: eng.chinamil.com.cn)

A J-10 fighter jet attached to an aviation brigade of the air force under the PLA Northern Theater Command flies through the valley during a recent aerial combat sortie. (Photo: eng.chinamil.com.cn)