“(A) the importation for, manufacture for, sale to, transfer to, or possession by the United States or a department or agency of the United States or a State or a department, agency, or political subdivision of a State, or a sale or transfer to or possession by a qualified law enforcement officer employed by the United States or a department or agency of the United States or a State or a department, agency, or political subdivision of a State, for purposes of law enforcement (whether on or off duty), or a sale or transfer to or possession by a campus law enforcement officer for purposes of law enforcement (whether on or off duty);
“(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;
