; and (2) all employees of the Department of Navy who are assigned to the Naval Nuclear Propulsion Program and are in the excepted service (as defined in section 2103 of title 5, United States Code) (other than such employees in statutory excepted service systems). . (b) Briefing (1) In general Not later than 180 days after the date of the enactment of this Act, the Administrator for Nuclear Security shall provide a briefing to the appropriate congressional committees on the implementation of section 3248 of the National Nuclear Security Administration Act, as added by subsection (a). (2) Appropriate congressional committees defined In this subsection, the term appropriate congressional committees means— (A) the congressional defense committees; (B) the Committee on Energy and Natural Resources of the Senate and the Committee on Energy and Commerce of the House of Representatives; and (C) the Committee on Homeland Security and Governmental Affairs of the Senate and the Committee on Oversight and Government Reform of the House of Representatives. (c) Conforming amendments Section 3116 of the National Defense Authorization Act for Fiscal Year 2018 ( Public Law 115–91 ) is amended— (1) by striking subsection (a); (2) by redesignating subsections (b), (c), and (d) as subsections (a), (b), and (c), respectively; and (3) in paragraph (1) of subsection (c), as so redesignated— (A) in subparagraph (A), by striking implementation of and all that follows through subsection (b) and inserting implementation of subsection (a)