Either registrar of any town may, in writing, direct the town clerk to mail a copy of the form prescribed in section 9-26, with an envelope for its return, to the last-known address of any person who, in the opinion of such registrar possesses the qualifications required of an applicant for admission as an elector under the provisions of section 9-26, and the town clerk shall forthwith comply with such direction. Upon request to the town clerk by any person, a copy of such form, with an envelope for its return, shall be mailed by the town clerk to any member of the armed forces, of the merchant marine or of any religious or welfare group or agency attached to and serving with the armed forces or any civilian employee of the United States employed outside of this state or to the spouse or a dependent of any of such persons or to any person temporarily residing outside the territorial limits of the several states of the United States and the District of Columbia, or it may be delivered in person if so requested.