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