Disaster Relief and Emergency Assistance Act ( 42 U.S.C. 5122 ), except as provided in section 40125(b). . (b) Conforming amendment Section 40125(b) of title 49, United States Code, is amended by striking or (D) and inserting (D), or (F) . 437. Evaluation of aircraft registration for small unmanned aircraft (a) Metrics Beginning not later than 180 days after the date of enactment of this Act, the Administrator of the Federal Aviation Administration shall develop and track metrics to assess compliance with and effectiveness of the registration of small unmanned aircraft systems by the Federal Aviation Administration pursuant to the interim final rule issued on December 16, 2015, entitled Registration and Marking Requirements for Small Unmanned Aircraft (80 Fed. Reg. 78593) and any subsequent final rule, including metrics with respect to— (1) the levels of compliance with the interim final rule and any subsequent final rule