; (B) the importation for, or sale or transfer to a licensee under title I of the Atomic Energy Act of 1954 for purposes of establishing and maintaining an on-site physical protection system and security organization required by Federal law, or possession by an employee or contractor of such licensee on-site for such purposes or off-site for purposes of licensee-authorized training or transportation of nuclear materials; (C) the possession, by an individual who is retired in good standing from service with a law enforcement agency and is not otherwise prohibited from receiving a firearm, of a semiautomatic assault weapon— (i) sold or transferred to the individual by the agency upon such retirement; or (ii) that the individual purchased, or otherwise obtained, for official use before such retirement; (D) the importation, sale, manufacture, transfer, or possession of a semiautomatic assault weapon by a licensed manufacturer or licensed importer for the purposes of testing or experimentation authorized by the Attorney General; or (E) the importation, sale, manufacture, transfer, or possession of a firearm specified in Appendix A to this section, as such firearm was manufactured on the date of introduction of the Assault Weapons Ban of 2018 . (5) For purposes of paragraph (4)(A), the term campus law enforcement officer means an individual who is— (A) employed by a private institution of higher education that is eligible for funding under title IV of the Higher Education Act of 1965 ( 20 U.S.C. 1070 et seq.); (B) responsible for the prevention or investigation of crime involving injury to persons or property, including apprehension or detention of persons for such crimes; (C) authorized by Federal, State, or local law to carry a firearm, execute search warrants, and make arrests