payment rate refers to the rate of progress payments provided for under section 3804 of title 10, United States Code, and payable in accordance with the applicable provisions of the Federal Acquisition Regulation and the Defense Federal Acquisition Regulation Supplement. (3) Under Secretary The term Under Secretary means the Under Secretary for Acquisition and Sustainment. (h) Sunset (1) In general Except as provided by paragraph (2), the authority to carry out the pilot program established under subsection (a) shall terminate on January 1, 2029. (2) Existing contracts Notwithstanding paragraph (1), a contractor that the Under Secretary determines under the pilot program established under subsection (a) shall be paid a higher progress payment under such pilot program with respect to a contract in effect as of the date described in paragraph (1) shall receive such higher progress payments until the earlier of— (A) the termination or expiration of the contract