Subject to the limitations provided in this chapter, the following classes of persons may peddle, conduct business, or practice the professions and semiprofessions in any county or municipality in this state without paying an occupation tax, administrative fee, or regulatory fee for the privilege of so doing, provided such person receives a certificate of exemption issued by the commissioner of veterans service:

(1) Any disabled veteran of any war or armed conflict in which any branch of the armed forces of the United States engaged, whether under United States command or otherwise;

(2) Any blind person; or

(3) Any veteran of peace-time service in the United States armed forces who has a physical disability incurred during the period of such service.