Federal government entities cannot copyright, everything they produce is public domain. They can hold trademark, but usually do not since they are not trading a

Federal government entities cannot copyright, everything they produce is public domain. They can hold trademark, but usually do not since they are not trading anything. USPS is a rare exception. NSA of couse has no goods or services. Thus the need for a specific law, as cited, to act in stead of the more familiar protections. Which law, it must be said, seems quite reasonably narrow, and should allow parody amongst other uses.