(b)
(1) In each request for proposals to enter into a time-charter contract for the use of a vessel for the transportation of supplies under this section, the Secretary of Defense shall require that any reflagging or repair work on a vessel for which a proposal is submitted in response to the request for proposals be performed in the United States (including any territory of the United States).
(2) In paragraph (1), the term reflagging or repair work means work performed on a vessel
(A) to enable the vessel to meet applicable standards to become a vessel of the United States; or
(B) to convert the vessel to a more useful military configuration.
(3) The Secretary of Defense may waive the requirement described in paragraph (1) if the Secretary determines that such waiver is critical to the national security of the United States. The Secretary shall immediately notify the Congress of any such waiver and the reasons for such waiver.