and setting a historical precedent could undermine the unique and paramount role of ballistic-missile submarines as the assured, survivable second-strike capability of the United States to deter large-scale nuclear war. (7) The United States should reject policies that increase the likelihood of nuclear war and weaken national security, including investments in low-yield nuclear weapons. 3. Prohibition on research and development, production, and deployment of Trident D5 low-yield nuclear warhead (a) In general Notwithstanding any other provision of law, none of the funds authorized to be appropriated or otherwise made available for fiscal year 2019 or any fiscal year thereafter for the Department of Defense or the Department of Energy may be obligated or expended for the research and development, production, or deployment of the Trident D5 low-yield nuclear warhead. (b) Conforming repeal and restoration Section 3111 of the John S. McCain National Defense Authorization Act for Fiscal Year 2019 ( Public Law 115–232