“ By virtue of and pursuant to the authority vested in me by section 1753 of the Revised Statutes of the United States (U.S.C., title 5, sec. 631) and as President of the United States, it is ordered that the Executive Order of January 17, 1873, as amended, prohibiting, with certain exceptions, Federal officers and employees from holding state, territorial and municipal offices, be, and it is hereby, suspended and made inoperative insofar as the United States Civil Service Commission shall, by regulation, authorize appointments to positions directly concerned with national defense. ”