"The National Park Service on Monday reinstated mask requirements, ordering visitors at national parks around the country to don face coverings when they are inside buildings or in crowded outdoor spaces.
According to the National Park Service, the requirement will apply to all park-goers, regardless of their vaccination status.
“Visitors to national parks are coming from locations across the country, if not across the world," National Park Service Deputy Director Shawn Benge said in a press release."
Source: The Hill, 08/18/2021