information  about  storage  requirements,  refer  to SECNAVINST 1550.36. MARKING CLASSIFIED MATERIAL Classified  material  is  marked  so  that  personnel know the classified nature of the material, to make sure the material receives the degree of protection required, and  to  help  extract,  paraphrase,  downgrade,  and declassify the material. All classified material is marked so you know the following information about the material: The level of classification The part(s) that contain(s) or reveal(s) classified information How long the material is to remain classified Additional  measures  needed  to  protect  the material Overall Markings Material is marked so the security markings are easy to see and recognize. Classified documents are marked on their face and back cover and top and bottom center to show the highest overall classification level of the  information  they  contain.  (NOTE:  Titles  of classified  documents  are  usually  unclassified.)  On documents,  the  classification  level  is  marked  or stamped in capital letters larger than the type used in the text to alert anyone handling the document that it is classified. Material is marked as follows: AUTOMATED  INFORMATION  SYSTEM (AIS).—Removable AIS (fig. 22-1) storage media and devices used with AIS and word processors are marked using the appropriate SF label to indicate the highest overall classification level of information contained in the storage media. PHOTOGRAPHS,  SLIDES,  AND  TRANS- PARENCIES.—The face of a classified photograph is marked with its highest overall classification level and associated  markings.  If  this  is  not  possible,  these markings are placed on the back of the photograph. These markings are stamped or permanently affixed by pressure tape, labels, or other similar means. Slides or transparencies (fig. 22-2) are marked with their highest overall classification level and association markings on the image area, border, holder, or frame. Groups  of  slides  or  transparencies  used  and  stored together as a set are marked with their highest overall classification level and associated markings. Associated markings “Classified by,” “Reason,” “Derived from,” and “Declassify on” are marked on the image area of the cover slide or transparency only. MOTION PICTURE FILMS, VIDEOTAPES, AND  CONTAINERS.—Classified  motion  picture films  (fig.  22-3),  videotapes,  and  their  titles  are prominently  marked  with  the  highest  overall classification  level  and  associated  markings  of  the information  they  contain.  The  markings  are  visible when  projected  at  the  beginning  and  end  of  the production.  Classified  films,  videotapes,  and  their containers are marked in the same manner. S O U N D R E C O R D I N G S A N D C O N - TAINERS.—Classified sound recordings (fig. 22-4) have an audible statement at the beginning and end of each recording. This statement identifies the highest overall classification level and associated markings of the recorded information. Containers of classified reels, cassettes,  videotapes,  and  motion  picture  films  are prominently  marked  with  the  highest  overall classification  level  and  associated  markings  of  the information contained. ROLLED  OR  FOLDED  DOCUMENTS.— Rolled or folded blueprints, maps, charts, or other large items are clearly marked to show their highest overall classification level (fig. 22-5). Portion Markings Each  portion  such  as  the  title,  section,  part, paragraph, or subparagraph of a classified document is marked to show its classification level. By doing this, a document is marked so you   know   what part or parts contain  or  reveal  protected  information.  The classification level of a part of a document is shown by a classification symbol—TS for Top Secret, S for Secret, C for Confidential, and U for unclassified. The symbol 22-5 Student Notes: