; and (2) an estimate of the cost savings that would result if all Foreign Service tandem couples were placed at a single post. 231. Accessibility at diplomatic missions Not later than 180 days after the date of the enactment of this Act, the Department shall submit a report to the appropriate congressional committees that includes— (1) a list of the overseas United States diplomatic missions that, as of the date of the enactment of this Act, are not readily accessible to and usable by individuals with disabilities; (2) any efforts in progress to make such missions readily accessible to and usable by individuals with disabilities