18 U.S.C. § 702 : US Code - Section 702: Uniform of armed forces and Public Health Service

      Whoever, in any place within the jurisdiction of the United
    States or in the Canal Zone, without authority, wears the uniform
    or a distinctive part thereof or anything similar to a distinctive
    part of the uniform of any of the armed forces of the United
    States, Public Health Service or any auxiliary of such, shall be
    fined under this title or imprisoned not more than six months, or
    both.