; (6) the term public agency includes a court system, the National Guard of a State to the extent the personnel of that National Guard are not in Federal service, and the defense forces of a State authorized by section 109 of title 32; and (7) the term public safety officer means an individual serving a public agency in an official capacity, as a law enforcement officer, as a firefighter, as a chaplain, or as a member of a rescue squad or ambulance crew. (b) Offense It shall be unlawful for any person to— (1) commit, or attempt to or conspire to commit, murder (within the meaning of section 1111(a)) or manslaughter (within the meaning of section 1112(a)) against— (A) a United States judge; (B) a Federal law enforcement officer; or (C) a federally funded public safety officer while that officer is engaged in official duties, or on account of the performance of official duties