; and (2) the current testing or remediation status of those installations, including remediation phase, estimated cost-to-complete, and estimated schedule, including the estimated number of sites anticipated to reach completion of remedy construction within three years of the date of submission of the report. 7. Government Accountability Office report on testing and remediation of perfluoroalkyl substances and polyfluoroalkyl substances Not later than one year after the date of the enactment of this Act, and once every five years thereafter, the Comptroller General of the United States shall submit to the congressional defense committees a report assessing the state of ongoing testing and remediation by the Department of Defense of current or former military installations contaminated with perfluoroalkyl substances or polyfluoroalkyl substances, including— (1) assessments of the thoroughness, pace, and cost-effectiveness of efforts of the Department to conduct testing and remediation relating to those substances; (2) recommendations to improve those efforts; and (3) such other matters as the Comptroller General determines appropriate.