All noncompetitive leases shall be considered issued when signed by the authorized officer. Noncompetitive leases, except future interest leases issued under Sec. 3110.9 of this title, shall be effective as of the first day of the month following the date the leases are issued. A lease may be made effective on the first day of the month within which it is issued if a written request is made prior to the date of signature of the authorized officer. Future interest leases issued under Sec. 3110.9 of this title shall be effective as of the date the mineral interests vest in the United States.