than NNPI. Do not mark those containing NNPI. Include the following statement in the body of the document to explain the absence of markings: Those paragraphs which are not marked for  classification  contain  naval  nuclear propulsion information (NNPI) which is exempt from the requirement for portion marking set forth in the Department of the Navy Information and Personnel Security Program  Regulation. Place the following downgrading and de- classification markings on documents containing classified NNPI that is not Restricted Data or Formerly Restricted Data: Classified by DOE-DOD Classification Guide CG-RN-1 dated January 1977. Declassify  On:  Originating  Agency’s Determination Required. This document shall not be used as a basis for derivative classification. Miscellaneous Materials Treat materials developed in connection with the handling, processing, production and use of classified information in a manner that ensures adequate protection.    Such materials include rejected copy, typewriter ribbons, carbons, and similar items. Destroy these materials at the earliest practical time. Omit marks, stamps, or other indications that the recorded information is classified unless needed to ensure its protection. PERSONNEL SECURITY CLEARANCES The basic policy of the Department of the Navy Personnel Security Program designates the Chief of Naval Operations (OP-09N) as the official  responsible  for  managing  the  security clearance program. The CNO (OP-09N) deter- mines  policy  for  granting  access  to  classified material. Persons  are  granted  access  to  classified material only if that access is clearly consistent with the interests of national security. Competent authority may determine a reasonable basis for doubting a military or civilian person’s loyalty to the government of the United States. If no doubt is determined, a person’s loyalty is assumed to be consistent with the interests of national security. This assumption applies to the appointment or retention  of  civilian  personnel  in  government positions and acceptance or retention of military personnel in the Navy and Marine Corps. CITIZENSHIP Only United States citizens are granted access to classified information or assigned to sensitive duties. Sensitive duties are those in which an assigned military member or civilian employee could  bring  about  an  adverse  effect  on  the national security. Any duties requiring access to classified information are sensitive duties. Reference to U.S. citizens in this text includes all U.S. citizens. It includes those who are U.S. citizens by birth, those who are naturalized citizens,  and  those  who  are  U.S.  nationals. Reference  to  non-U.S.  citizens  in  this  text relates to immigrant aliens and foreign nationals. Immigrant aliens are those who have been lawfully admitted to the United States for permanent residence.  Foreign  nationals  are  defined,  for security purposes, as the following: Those who are not U.S. citizens, U.S. nationals, or immigrant aliens Those immigrant aliens who have failed to become citizens Those U.S. citizens or immigrant aliens who  represent  a  foreign  government, foreign  private  interests,  or  foreign nationals when they are acting in that capacity With few exceptions, the Navy and Marine Corps will accept only U.S. citizens as officers but will accept immigrant aliens as enlisted. Under a U.S.-Republic of the Philippines agreement, the Navy may enlist nonimmigrant aliens. Enlisted immigrant aliens (and Philippine nonimmigrant aliens) may not enter into ratings or military occupational  specialties  (MOS)  that  generally require  access  to  classified  information.  They are allowed access to classified information or assigned to sensitive duties only when specifically authorized by OP-09N. The Navy and Marine Corps considers all other foreign nationals to be foreign representatives. They are governed by the foreign disclosure policies and procedures in  OPNAVINST  5510.48J  and  OPNAVINST S5510.155C. 9-39