The provisions of this part apply to all Agency installations, and to all persons entering on to or when on an Agency installation. They supplement the provisions of Title 18, United States Code, relating to crimes and criminal procedures, and those provisions of State law that are federal criminal offenses by virtue of the Assimilative Crimes Act, 18 U.S.C. 13. The Director of Central Intelligence, at his discretion, may suspend the applicability of this part, or a portion thereof, on any Agency installation, or any portion of the installation, covered under this part. Where necessary and when consistent with national security requirements notices will be posted on the affected Agency installation to indicate that the applicability of this part or a portion thereof has been suspended.