Look at the picture at the link. We're harped on day-after-day-after-day to wear the mask to prevent the spread.
They all HAVE MASKS ON ! So what are they worried about ???
They found a UNION rep...from one of the Uniformed divisions of the Secret Service. The Presidential detail officers are not, afai am able to determine, unionized. But Secret Service is under the DHS which has unionized elements. You know Government Employees Union-
The American Federation of Government Employees
https://www.afge.org/about-us/agencies/