Figure 1-1.—Example of security markings in a Naval message. Figure 1-1.—Example of security markings in a Naval message.

that person is employed by the U.S. Government. SPECAT (SPEcial CATegory): Message traffic associated with a special project or subject, with access and handling limited to only those personnel designated in writing by the commanding officer. LIMDIS (LIMited DIStribution): Distribution within the receiving activity is limited only to those personnel with specific access and need- to-know. PERSONAL FOR: A classified or unclassified message with distribution limited only to the named recipient(s), normally commanding officers or flag officers. WNINTEL: This is a control marking that denotes "Warning Notice-Sensitive Intelligence Sources or Methods Involved." Classified intelligence so marked must not be disseminated in any manner outside of authorized channels without the permission of the originator. All classified information or information that requires special handling must be clearly marked. Normally, printed pages are marked at the top and bottom with a stamp or large machine-printed letters. Classified words, subjects, or titles are marked at the end of the subject line in parentheses. Information within each paragraph or section of a narrative is identified with the security classification and special handling marking at the beginning of each paragraph or section. Figure 1-1 shows an example of these markings. OPNAVINST 5510.1 also discusses requirements for granting a security clearance for access to classified information. Access to classified information is granted only on a "need-to-know" basis. You will only be granted access to classified information that is necessary to perform your assigned duties. Within your command, the Security Officer maintains a list of all permanent party and visitor security clearances and levels of access. Classified information may not be discussed with anyone whose clearance and access level cannot be verified. As we discuss communications systems in the next section, you will see that most of the environmental information is handled and stored on computers and automated systems. The Department of the Navy has instituted a special security program to protect automated information systems. Your activity has an Automatic Data Processing Security Officer (ADPSO) who is responsible for the security of all personal computers (PCs) and PC based data handling, data processing, and communication systems. The ADPSO is also responsible for the security of other ADP systems, such as the Tactical Environmental Support System (TESS). The ADPSO will provide special security training for personnel that use automated systems as well as control access to these systems. SECRET-NOFORN Subj: THIS IS AN EXAMPLE OF A CONFIDENTIAL NOFORN SUBJECT (C-NF) Ref: (a) This is an example of an unclassified reference used in a classified message or other correspondence (U) (b) This is an example of a confidential reference title (C) 1. (C) This is an example of a confidential paragraph within a narrative. 2. (U) The second paragraph in this example is unclassified. The (U) only precedes a paragraph of unclassified information in a document containing classified information. 3. (S-NF) This is an example of a secret, no forn paragraph. The entire document must be classified equal to the highest classification and strictest special handling markings of any material contained within the document. S E C R E T - NOFORN (SECURITY MARKINGS FOR ILLUSTRATIVE PURPOSES ONLY) Figure 1-1.—Example of security markings in a Naval message. 1-2