Whenever a ballot is requested pursuant to section 53.39 or 53.45 on behalf of a voter in the armed forces of the United States, the affidavit upon the envelope marked with the affidavit of such voter, if the voter is found to be an eligible elector of the county to which the ballot is submitted, shall constitute a sufficient registration under chapter 48A. A completed federal postcard registration and federal absentee ballot request form submitted by such eligible elector shall also constitute a sufficient registration under chapter 48A. The commissioner shall place the voter’s name on the registration record as a registered voter if it does not already appear there. The identification requirements of section 48A.8 and the verification requirements of section 48A.25A do not apply to persons who register to vote under this subchapter.