10421    Providing for the Physical Security of Facilities Important to
          the National Defense
          Signed: December 31, 1952
          Federal Register page and date: 18 FR 57, January 3, 1953
          Amended by: EO 10438, March 13, 1953; EO 10773, July 1, 1958; EO
          11051, September 27, 1962; EO 12148, July 20, 1979
          Revoked by: EO 12656, November 18, 1988
          See: EO 11725, June 27, 1973