19 CFR 10.63: Landing of supplies and stores from receiving vessel in the United States.

Supplies or stores laden on a vessel duty and tax free under section 309, Tariff Act of 1930, as amended, may be landed under Customs supervision under proper permit, the same as if they had been laden in a foreign country. See § 4.39 of this chapter. Except when transfer to another vessel entitled to the free withdrawal privilege is permitted under the original withdrawal under section 309, Tariff Act of 1930, as amended, the landed articles shall be treated as an importation from a foreign country.