Assimilative Crimes Act, §289, Criminal Code, 54 Stat. 234, 18 U.S.C. §468, 18 U.S.C.A. §468, reads: 'Whoever, within the territorial limits of any State, organized Territory, or district, but within or upon any of the places now existing or hereafter reserved or acquired, described in section 272 of the Criminal Code (U.S.C., title 18, sec. 451), [FN1] shall do or omit the doing of any act or thing which is not made penal by any laws of Congress, but which if committed or omitted within the jurisdiction of the State, Territory, *713 or district in which such place is situated, by the laws thereof in force on February 1, 1940, and remaining in force at the time of the doing or omitting the doing of such act or thing, would be penal, shall be deemed guilty of a like offense and be subject to a like punishment.'