54 U.S.C. § 308106

Not later than 2 years after the date of the enactment of this section, and every 10 years thereafter, the Secretary shall submit to Congress a report that updates the Battlefield Reports to reflect— (1) preservation activities carried out at the battlefields in the period since the publication of the most recent Battlefield Reports update; (2) changes in the condition, including core and study areas, of the battlefields during that period; and (3) any other relevant developments relating to the battlefields during that period.