An armed policeman says goodbye to a police dog during a ceremony held to mark the retirement of armed police in Shizuishan, Northwest China's Ningxia Hui Autonomous Region, August 28, 2019. (Photo: China News Service)

Armed police solute during a ceremony held to mark their retirement in Shizuishan, Northwest China's Ningxia Hui Autonomous Region, August 28, 2019. (Photo: China News Service)

Soon-to-retire armed police hand over guns to new recruits during a ceremony in Shizuishan, Northwest China's Ningxia Hui Autonomous Region, August 28, 2019. (Photo: China News Service)

An armed policeman kisses goodbye to a gun during the retirement ceremony in Shizuishan, Northwest China's Ningxia Hui Autonomous Region, August 28, 2019. (Photo: China News Service)