conspicuously marked with the appropriate classification at the top and bottom of each page, The markings must be placed in a position where they will not become covered in assembly, removal, or trimming. When the reverse sides of pages are used, they must be similarly marked with the classification. All reproductions or copies of classified material, regardless of form, must bear clear, legible classification markings in the same manner as the originals. Not all copy equipment re- produces colors of ink or marginal images; therefore, personnel engaged in marking copies must make sure the reproduced copies are marked or stamped with the classification on all copies in the same position and size required for the originals. The manner of marking classified equipment, products, or substance depends on the nature of the material, Normally, the assigned classification should be marked by stamping, etching, or attaching a classification plate. When it is not possible, the container must be appropriately marked. When the article or container cannot be marked, written notification of the assigned classification must be furnished to the consignee of the material. The lettering of the classification stamp or mark must be all capitals and in red color, and, when practical, must be larger in size than the type size of the text. CUSTODIAL PRECAUTIONS Classified material is not removed from the physical confines of a command without the knowledge and approval of the commanding officer or an authorized representative. When classified material is removed, a complete list is prepared, signed by the individual removing the material, and appropriately filed until the material is returned. CARE DURING WORKING HOURS Each person in the Navy must take every precaution to prevent deliberate or casual access to classified information by unauthorized persons. The precautions that must be followed are described in the following paragraphs. When classified documents are removed from stowage for working purposes, they must be kept under constant surveillance or face down or covered when not in use. Drafts, carbon sheets, carbon paper, typewriter ribbons, plates, stencils, stenographic notes, worksheets, and similar items containing classified information are either destroyed by the person responsible for the preparation after they have served their purpose or are given the same classification and safeguarding in the same manner as the classified material produced from them. After the upper and lower sections of a fabric typewriter ribbon have been cycled through the typewriter at least five times, the ribbon may be treated as unclassified. Classified material, upon receipt, is opened by the addressee or the persons specifically auth- orized by the addressee in writing to open material of the grade involved. If for any reason a space must be vacated during working hours, any classified material therein must bestowed accord- ing to stowage instructions for the classification involved. CARE AFTER WORKING HOURS A system of security checks at the close of each working day must be instituted to make sure classified material held by a command is properly protected. Custodians of classified material are required to make an inspection that guarantees the following precautions have been fulfilled: 1. All classified material is stowed in the prescribed manner. 2. Burn bags are properly stowed or destroyed. 3. Classified shorthand notes, carbon paper, typewriter ribbons, rough drafts, and similar papers are properly stowed or destroyed. As a matter of routine during the day, such items must be placed in burn bags immediately after they have served their purpose. 4. Identification of the individual responsible for the contents of each container of classified material must be readily available. The individual so identified is contacted in the event a container of classified material is found open and unattended. CARE OF WORKING SPACES The necessary safeguards must be afforded to buildings and areas in which classified informa- tion is kept. Precautions must also be taken to minimize any danger or inadvertent disclosure of classified material in conversation. You must not discuss classified information in public places. 1-8