Ground crew members assigned to a naval aviation unit under the PLA Northern Theater Command use flag signal to guide a KJ-200 airborne early warning (AEW) aircraft during a recent long-range early warning detection training exercise. (eng.chinamil.com.cn/Photo by Xing Yun, Yang Kaikai, Du Chunhao, Mou Houkui, Jiang Langtao, Wu Zhixiang, Su Zhaoqun and Wang Yarun)