; enacted as subtitle B of title VIII of the Trade Facilitation and Trade Enforcement Act of 2015; 19 U.S.C. 4301 et seq.) is amended to read as follows: (B) a port of entry vacancy rate which compares the number of officers identified in subparagraph (A) with the number of officers at the port at which such officer is currently assigned. . (d) Definition Subsection (r) of section 411 of the Homeland Security Act of 2002 ( 6 U.S.C. 211 ) is amended— (1) by striking this section, the terms and inserting the following: this section: (1) the terms ; (2) in paragraph (1), as added by subparagraph (A), by striking the period at the end and inserting ; and ; and (3) by adding at the end the following new paragraph: (2) the term unmanned aerial systems has the meaning given the term unmanned aircraft system in section 331 of the FAA Modernization and Reform Act of 2012 ( Public Law 112–95