; and (2) in paragraph (2)— (A) by striking the Secretary may and inserting the following: “the Secretary— (A) may ; (B) by striking the period at the end and inserting ; and ; and (C) by adding at the end the following: (B) shall begin procurement and fielding of a follow-on air-launched cruise missile to the AGM–86 for conventional missions not more than five years after the successful completion of initial operational test and evaluation for such a missile for nuclear missions. . (b) Statement of policy It is the policy of the United States to design and procure the long-range standoff weapon to provide a nuclear cruise missile capability to replace the AGM–86 as part of the modernization of the nuclear triad. 1643. Exchange program for nuclear weapons program employees (a) Program authorized The Chairman of the Nuclear Weapons Council established under section 179 of title 10, United States Code, and the Administrator for Nuclear Security, shall jointly establish an exchange program under which— (1) the Chairman shall arrange for the temporary assignment of civilian and military personnel working on nuclear weapons policy, production, and force structure issues in the Office of the Secretary of Defense, the Joint Staff, the Navy, or the Air Force to the Office of the Deputy Administrator for Defense Programs in the National Nuclear Security Administration; and (2) the Administrator shall arrange for the temporary assignment of civilian personnel working on programs related to nuclear weapons in the Office of the Deputy Administrator for Defense Programs to the elements of the Department of Defense specified in paragraph (1). (b) Purposes The purposes of the exchange program established under subsection (a) are— (1) to familiarize personnel from the Department of Defense and the National Nuclear Security Administration with the equities, priorities, processes, culture, and employees of the other agency