In any city or town which accepts the provisions of this section no uniformed police officer, and no other uniformed person empowered to make arrests, employed by such city or town shall be required to wear a badge, tag or label of any kind which identifies him by name, but any such officer or other person employed by such city or town who does not wear any such badge, tag or label shall wear a badge, tag or label which identifies him by number.
Massachusetts Legal Code