Section 138. Use of certain governmental, military or naval names

1. It
  shall be unlawful and is prohibited for any person, firm, corporation or
  association, not an agency  or  instrumentality  of  the  United  States
  government, selling or offering for sale goods, wares or merchandise, to
  use  or  cause  or  permit  to be used in the corporate or trade name or
  description of the seller or of the place  where  the  goods,  wares  or
  merchandise  are  offered  for  sale,  any  of  the  following  words or
  expressions, viz., "army," "navy,"  "marine  corps,"  "marines,"  "coast
  guard," "government," "post exchange," "P. X.," or "G. I.," unless there
  is  displayed  in conjunction therewith, in letters of at least the same
  size as such words or expressions, the words, "we sell articles acquired
  from the United States government  only,"  or  "we  sell  both  articles
  acquired from the United States government and non-government articles,"
  as the case may be.
    2. No person, firm, corporation or association selling or offering for
  sale any article of merchandise, shall in any manner represent, contrary
  to  fact,  that  the  article  was  made  for,  or  acquired directly or
  indirectly from, the United States government or its military  or  naval
  forces  or  any  agency  of  the  United  States government, or that the
  article conforms to government specifications or requirements,  or  that
  it has been disposed of by the United States government.