; (B) the contracting officer provides the written approval to the contractor; and (C) the head of the agency notifies the congressional defense committees of the approval. (2) The contract modification unilaterally definitizing the action shall not take effect until 60 calendar days after the congressional defense committees have been notified under subparagraph (C) of such paragraph. . (b) Conforming regulations Not later than 120 days after the date of the enactment of this Act, the Secretary of Defense shall revise the Department of Defense Supplement to the Federal Acquisition Regulations to conform with the amendments made by subsection (a). 824. Restriction on use of reverse auctions and lowest price technically acceptable contracting methods for safety equipment (a) In general Section 814 of the National Defense Authorization Act for Fiscal Year 2017 ( Public Law 114–328 ) is amended— (1) in the section heading, by inserting and safety equipment after personal protective equipment ; and (2) by inserting and safety equipment after personal protective equipment . (b) Conforming amendments The tables of sections in section 2(b) of such Act and at the beginning of title VIII of such Act are amended in the item relating to section 814 by inserting and safety equipment after personal protective equipment . 825. Use of lowest price technically acceptable source selection process (a) Additional requirements Subsection (b) of section 813 of the National Defense Authorization Act for Fiscal Year 2017 ( Public Law 114–328 ) is amended— (1) in paragraph (5), by striking ; and and inserting a semicolon; (2) in paragraph (6), by striking the period at the end and inserting a semicolon; and (3) by adding at the end the following new paragraphs: (7) the Department of Defense would not realize any additional innovation or future technological advantage by using a different methodology