; (2) in section 4204— (A) in subsection (a)— (i) in the matter preceding paragraph (1)— (I) by inserting , modernization, and replacement, as required, after effective management ; and (II) by striking , including the extension of the effective life of such weapons ; (ii) in paragraph (1), by striking increase the reliability, safety, and security and inserting enhance the performance and reliability ; (iii) by redesignating paragraphs (3), (4), and (5) as paragraphs (4), (5), and (6), respectively; (iv) by inserting after paragraph (2) the following new paragraph (3): (3) To maintain the safety and security of the nuclear weapons stockpile. ; and (v) by amending paragraph (4), as so redesignated, to read as follows: (4) To optimize the future size of the nuclear weapons stockpile. ; and (B) in subsection (b)— (i) in paragraph (1)— (I) by striking made to achieve and inserting consistent with ; and (II) by striking ; and and inserting a semicolon; (ii) by redesignating paragraph (2) as paragraph (3); (iii) by inserting after paragraph (1) the following new paragraph (2): (2) any changes made to the stockpile consistent with the objectives identified in subsection (a) are carried out in a cost effective manner; and ; and (iv) in paragraph (3)— (I) by amending subparagraph (A) to read as follows: (A) are well understood and certifiable without the need to resume underground nuclear weapons testing ; and (II) by adding at the end the following new subparagraph: (C) develop future generations of design, certification, and production expertise in the nuclear security enterprise to support the fulfillment of mission requirements of the future stockpile. ; (3) in section 4209(a)(1), in the matter preceding subparagraph (A), by striking phase 1 or phase 6.1 and inserting phase 2 or phase 6.2 ; (4) in section 4212— (A) in subsection (a)(1), by striking, as specified in the most recent Nuclear Posture Review