Why are SWAT guards isolated?

The guards of the swat team were isolated because they didn't fit in. Comrade-in-arms and instructors fight, Duan does not help, so he is not suitable. Duan Weibing doesn't know how to blend in, cheat, report, and be isolated because he is suspected of being a traitor. Duan Weibing in SWAT Team was played by actor Wang Tianye. He used to be a sergeant in spike's special forces. After retiring, he joined the special police team and became a member of Little Tiger.