31 C.F.R. § 315.45
Reissue of a bond may be made only under the conditions specified in these regulations, and only at:
(b) The Bureau of the Fiscal Service.
Reissue will not be made if the request is received less than one full calendar month before the final maturity date of a bond. The request, however, will be effective to establish ownership as though the reissue had been made.