Warfare Coordination, NWP 3-51.1 (formerly NWP 10-1-40). SECURITY AREAS Different spaces aboard ship and different areas within a shore activity usually have varying degrees of security  importance.  The  degree  of  security  of  each area depends upon its purpose and the nature of the work, information, equipment, or materials concerned. Access to security areas must be controlled in a manner consistent with the security level. SANITIZING SITE AND EQUIPMENT Sanitizing an area or equipment is done to make it acceptable  for  access  by  personnel  who  are  not  cleared. This is used to prevent unauthorized persons from gaining access that would allow them to identify the purpose or nature of your work, information, equipment and materials concerned. To meet this situation, each command should apply differing  protective  measures  commensurate  with  the degree of security importance. Persons who have not been cleared for access to the information contained within the area, with appropriate approval, may be admitted into an area, but they must be controlled by an escort at all times. Follow guidelines set forth in the Security   Manual   and   local   standard   operating procedures. A few of the basic requirements are listed below. Remove, turn over, or place in drawers any classified material that may be out on desks. Replace any keying material in the safe and lock. Cover any status boards showing conditions of equipment, frequencies, systems, and so forth. Cover all frequencies dialed into equipment. Cover monitors or turn off monitor screens if possible. Do not conduct any work-related discussions. At no time will the escort leave someone unattended. The  watch  section  or  day  working  staff  maybe  required to support the escort in cases where work is being conducted  by  numerous  uncleared  personnel  in  more than  one  area. RESTRICTED AREAS Designating security spaces as restricted areas provides  an  effective  and  efficient  means  for  a command to restrict access and control movement. In restricted areas, only those personnel whose duties actually  require  access  and  who  have  been  granted appropriate security clearance are allowed freedom of movement within the area. Persons who have not been cleared for access to the information  contained  within  the  area  may,  with appropriate approval, be admitted into the area. While in these spaces, however, uncleared persons must be escorted, or other security procedures implemented to prevent  any  unauthorized  disclosure  of  classified information. All designated restricted areas must have warning signs posted at all entrances and exits. These areas must have  clearly  defined  perimeters  and,  if  appropriate, Restricted Area warning signs posted on fences and barriers. Access to Spaces The commanding officer or the officer in charge over security spaces is responsible for controlling access  to  these  areas.  Procedures  should  limit  access  to security spaces only to those persons who have a need to know. No one has a right to have access to classified information or spaces based solely on clearance, rank, or  position. Each  command  establishes  a  pass  or  badge identification system to restrict access and to help control movement. Control of movement within the area  is  normally  accomplished  by  requiring  the  display or presentation of the pass or badge for that particular area. Access List Admission of visitors to communications spaces is a topic of major concern to radiomen since access to communications  spaces  under  operating  conditions usually  permits  viewing  of  classified  traffic  and equipment. A security badge does not automatically mean that visitors have a “need to know” or that they should   be   granted   access.   Admission   to communications spaces is granted only to personnel whose  names,  rates/ranks,  and  clearance  level  appear on  the  official  access  list. 5-3