Why does the factory recruit security guards instead of security guards?

1. There is a difference between a security guard and a doorman. 2. The security guard is a person who has been systematically trained by the public security department, passed the examination and has a work permit. Theoretically, security guards belong to security companies (institutions directly under the Public Security Bureau) and are sent to employers. 2. The doorman belongs to the company's self-employed personnel, without any information requirements, and can't wear security uniforms.