Those are the Safety Officers.
20 years ago I belonged to a radio club, and we had antenna on the roof of a local hospital, about 10 stories up. It was a restricted-access space, so there were no railings. We had a work session one Saturday involving guy ropes. One member insisted on handling ropes, and more than once he would walk backwards helping raise the mast, "Steve, watch it! Edge!" IOW, somebody's job became saving Steve from himself.
Steve's day job? OSHA inspector. Seriously.