; and (2) to marshal the full weight of statutory and regulatory measures available to the United States Government to ensure that the Secretary of Defense and the Secretary of Energy are provided with all necessary authorities and resources required to ensure the maintenance of a modern, effective strategic deterrent to meet the emerging suite of unprecedented strategic threats against the United States. 4. Assessment of updated force sizing requirements (a) In general Not later than 1 year after the date of the enactment of this Act, the Secretary of Defense and the Chairman of the Joint Chiefs of Staff shall submit to the congressional defense committees a strategy that enables the United States to concurrently— (1) achieve the nuclear employment objectives of the President against any adversary that conducts a strategic attack against the United States or its allies; (2) hold at risk all classes of adversary targets described in the nuclear weapons employment guidance issued by the President as of the date of the enactment of this Act; (3) defeat the conventional military aggression of a major adversary in one geographic theater, while simultaneously providing a credible conventional deterrent to opportunistic aggression in a separate geographic theater; (4) provide a credible defense against limited long-range strikes against the United States homeland; (5) satisfy requirements of the combatant commands for the presence of surface and subsurface Navy forces at rates of 80 percent or more