There are exceptions to the face mask rule. This is one of eight exceptions:
Persons who are engaged in outdoor work or recreation such as swimming, walking, hiking, bicycling, or running, when alone or with household members, and when they are able to maintain a distance of at least six feet from others.
Clearly the distance rule cannot be maintained in a shuttle, etc, but easily done at both of our launch sites, and in the LZ (outside the shelter areas) so wearing masks is a personal choice and not a mandate. Studies on the spread of the virus have shown outdoor transmission is rare and low risk.
A thorough explanation of Sacramento’s face mask rules can be found with the below link: