; and (9) the Senate encourages the Secretary of Defense to refine the National Defense Strategy into more specific operational tasks and force planning scenarios that the joint force must be ready and able to perform in order to facilitate a better understanding of joint force development priorities and the roles and missions of each Armed Force. (b) Report on roles and missions (1) Report required Not later than February 1, 2019, the Secretary of Defense shall submit to the congressional defense committees a report setting forth a re-evaluation of the highest priority missions of the Department of Defense, and of the roles of the Armed Forces in the performance of such missions. (2) Goals The goals of the re-evaluation required for purposes of the report shall be as follows: (A) To support implementation of the National Defense Strategy. (B) To optimize the effectiveness of the joint force. (C) To inform the preparation of future defense program and budget requests by the Secretary, and the consideration of such requests by Congress. (c) Elements The report required by subsection (b) shall include the following: (1) A detailed description of the pacing threats for each Armed Force, and for special operations forces, and an assessment of the manner in which such pacing threats determine the primary role of each Armed Force, and special operations forces, including the connection between key operational tasks required by contingency plans. (2) A specific requirement for the size and composition of each Armed Force, including the following: (A) The required total end strength and force structure by type for the Army. (B) The required fleet size of the Navy, identified by class of ships and the corresponding total end strength requirement once that fleet size is achieved. (C) The required number of operational Air Force squadrons, identified by function and the corresponding total end strength requirement once that number of squadrons is achieved. (D) The required total end strength and force structure by type for