A neighbor across the street, who was older than I was, left home, went to Houston, and joined the police department. Over the years he advanced with his duties, and eventually became part of the Secret Service guarding Walter Mondale, which was his task up to retiring. I had one conversation with him years later, when he was visiting his mother.
The conversation we had was generally just catching up, nothing of real importance, but fascinating. He would look me in the eye, but only for a short period of time. It was as though he was analyzing my expression, categorizing what he saw, and his eyes would then return to the constant scanning of everything around. I determined his training had changed him into a person that was supremely aware of their surroundings, analyzing the possibilities of threats, and constantly focused on everything.
I feel too many of Trump's detail were not trained as they should be. They are supposed to protect the President by shielding him, but they are also supposed to be aware of any security gaps, possible threats, and prevent them from happening. If they weren't Secret Service, they were probably unqualified.