; (2) a description of the exigent circumstances; and (3) a description of how waterborne security will be maintained until new waterborne security barriers are procured and installed. . 122. Capabilities based assessment for naval vessels that carry fixed-wing aircraft (a) In general Not later than 30 days after the date of the enactment of this Act, the Secretary of the Navy shall initiate a capabilities based assessment to begin the process of identifying requirements for the naval vessels that will carry fixed-wing aircraft following the ships designated CVN–81 and LHA–9. (b) Elements The assessment shall— (1) conform with the Joint Capabilities Integration and Development System, including Chairman of the Joint Chiefs of Staff Instruction 5123.01H