Except for military personnel and civilian employees of the United States in the performance of their official duties, entry upon Naval Submarine Base, Bangor, or remaining thereon by any person whatsoever for any purpose without the advance consent of the Commanding Officer, SUBASE Bangor or his authorized representative is prohibited. See, 18 U.S.C. 1382; the Internal Security Act of 1950, Section 21 (50 U.S.C. 797); Department of Defense Directive 5200.8 of 25 April 1991; Secretary of the Navy Instruction 5511.36A of 21 July 1992.