While TASO will not require on-field officials to wear a face covering on the field, the individual venues may require on-field officials, clock operators, chain crews, etc. to wear them, within the facilities, and/or on the field. To paraphrase, when in Rome, you must do as the Romans dictate. Like it or not. Strongly recommend that your assigners contact the schools to find out what the requirement will be at each venue, to give officials an advanced opportunity to decline to work at a venue, if they feel that strongly about not wearing a mask, or are un-equipped.