Most security failures don’t happen because nobody showed up, usually someone is there.
They happen because nobody can prove that someone did.
Guard patrols have been a cornerstone of physical security for over a century. They exist for a simple reason: buildings cannot watch themselves. Locks, cameras, and alarms can detect and record, but only human presence can interpret, intervene, and respond in real time.
But the value of a guard patrol has never been in the walking itself. It has always been in what that walking represents; assurance. Assurance that someone checked the vulnerable door. Assurance that the fire exit was secure. Assurance that nothing was missed.
The challenge, historically, has been proving that assurance was justified.