Su-30 fighter jets sit abreast on the flightline and receive pre-flight checks in preparation for the PLA Air Force annual penetration and assault competition assessment --"Golden Dart" in northeastern China on April 15, 2018. Over 200 pilots will compete for the "Golden Dart" award during the competition by conducting air penetration and assault operations against ground air defense troops. (eng.chinamil.com.cn/Photo by Yang Pan)
