A ground crew assigned to a naval aviation regiment under the PLA Northern Theater Command uses flag signals to guide a KJ-200 airborne early warning (AEW) aircraft during a flight training exercise in Jiaodong Peninsula of eastern China's Shandong Province on February 24, 2018. (eng.chinamil.com.cn/Photo by Xing Yun, Xie Junjie, Ye Weixin and Yan Menglong)