Why should Xinjiang compile police for a bunch of undertakings?

For the safety of the motherland. According to media reports, Xinjiang police have to be on duty 24 hours a day. The weather in Xinjiang is bad, windy and rainy, with heavy snow and unbearable heat. It is difficult for ordinary people to wait there for a long time. In order to safeguard national security, a large number of police are stationed in Xinjiang.