Requirement
Compliance with CDC guidelines with respect to wearing masks is required for on-duty or on-site federal employees, on-site federal contractors; and all persons in federal buildings or on federal lands.
CDC requires persons over age 2 to wear a mask on a conveyance (aircraft, train, vehicle, vessel) and while in a transportation hub (airport, bus terminal, seaport, etc.). Operators of conveyances arriving or departing a U.S. port of entry must require travelers to wear masks. Private conveyances for non-commercial use, commercial motor vehicles, military conveyances are excluded. The definition of mask does not include a face shield.
It is also recommended that everyone wear a cloth face covering in public settings where other social distancing measures are difficult to maintain. Face shields are not recommended as a substitute for masks.