105. Subject matter of copyright: United States Government works Copyright protection under this title is not available for any work of the United States Government, but the United States Government is not precluded from receiving and holding copyrights transferred to it by assignment, bequest, or otherwise.
http://www.copyright.gov/title17/92chap1.html#105 It's not copyrighted.
"You tweachewous miscweant!" -- Elmer Fudd