; (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 ammunition, of a large capacity ammunition feeding device— (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; or (D) the importation, sale, manufacture, transfer, or possession of any large capacity ammunition feeding device by a licensed manufacturer or licensed importer for the purposes of testing or experimentation authorized by the Attorney General. (4) For purposes of paragraph (3)(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