Soldiers in Mission-Oriented Protective Posture (MOPP) gears use the chemical agent detectors to detect hazardous chemical warfare agents at a parking apron of a military airfield during a scenario-driven chemical defense training exercise on January 18, 2018. They are assigned to a chemical defense group of the air force under the PLA Western Theater Command. (eng.chinamil.com.cn/Photo by Xiao Yanjin)
