Authorized issuing agents delivered Series HH bonds by mail at the risk and expense of the United States to the address given by the applicant, if it is within the United States, one of its territories or possessions, or the Commonwealth of Puerto Rico. No mail deliveries elsewhere were made. Bonds acquired by a citizen of the United States residing abroad were delivered only to such address in the United States as the applicant directs.
31 C.F.R. §352.9