the appearances of the officers and their fitness
A security escort's main job is to think about safety. The safety challenges they face depend on their job and where they work, but no matter what security escorts need to assess threats, secure sensitive items or people, and defend clients physically if necessary.
A security escort could work for a secure building, such as a government office or private corporation that handles sensitive information. They are responsible for making sure that only authorized personnel are in the building and escorting any visitors or contractors as they go about their business.
Some security escorts don't work for offices or buildings but for individual people. They follow people in need of extra security, such as vulnerable students on a campus late at night or important parties traveling to dangerous areas, and make sure that they get safely from point A to point B. Security escorts need to be ready to work nights and weekends. Danger doesn't wait for office hours and neither do they.