COST ITEMS—Material used in ship’s store service activities (such as the barbershop or laundry) in the performance of a service to patrons, and items sold  through  cup-type  vending  machines. CRITICAL   ITEM—An   item   essential   to   the operational  readiness  of  a  ship  or  aircraft.  It  is  in short supply in system stocks (or expected to for an  extended  period  of  time).  Lists  of  critical items,  with  reporting  instructions,  are  distributed periodically  by  inventory  managers  (ASO  and SSPO)  to  designated  ashore  and  afloat  activities. The term may also be used afloat to refer to high usage,  bulky  consumables  (e.g.,  “never  out”  items such  as  rags,  toilet  paper,  etc.)  that,  because  of space constraints, must be replenished at every opportunity. CUBE—The amount of space occupied by an item to be shipped. It is normally expressed in cubic feet to  the  nearest  tenth.  The  cube  of  an  item  is determined by multiplying the length times the width times the height. CUSTODY—Responsibility   for   the   care,   stowage, use,  and  records  of  Navy  material. D E F E N S E    T R A N S P O R T A T I O N    S Y S T E M (DTS)—Consists  of  military  controlled  terminal facilities;   Military   Airlift   Command   (MAC) controlled   aircraft;   Military   Sealift   Command (MSC)   controlled   or   arranged   sealift;   and government-owned  or  controlled  air  or  land transportation. DEMAND—The  total  quantity  of  an  item  that  has been  used  during  a  specific  period  of  time.  A request for a not carried item to be procured. An issue of a stock item. DEMAND-BASED   ITEM   (DBI)—Peacetime operating stock (POS) items. DIRECT   TURNOVER   (DTO)   MATERIAL—Any consumable,  repair  part,  or  equipage  item  ordered from sources external to the ship for DTO to the using  department  for  immediate  or  planned  use. DLA—Defense   Logistics   Agency   Supply   System. Management responsibility and control of items in common use by all military services. DOCUMENT   IDENTIFIER-A   three-digit   code that   identifies   the   purpose   of   a   MILSTRIP document. DODPM—Department of Defense Military Pay and Allowance Manual. DTG—Date/Time   Group.   The   identifying   number assigned to naval messages by the originator. It consists of the date, time, month, and year. DTO—Direct  Turnover.  Material  ordered  to  fill  an immediate  requirement  and  issued  to  the requesting  department  upon  receipt. DUNNAGE—Material  (such  as  lumber  or  burlap) used  in  stowing  material  to  provide  protection  to both the material and the ship. EIC—Equipment Identification Code. A seven-digit alphanumeric  code  used  to  identify  an  equipment or its components or parts for the Maintenance Data  Collection  System. ENDURANCE—The  period  of  time  required  for  a ship to use a definite quantity of supplies. END-USE—Refers   to   the   final   accounting   for material when it is issued from a stems account with a charge to operating finds. EQUIPAGE—Items of a durable nature that are not consumed in use and are essential to the ship’s mission. An   allowed   quantity   is   usually determined  on  an  individual  ship  basis  and  is contained in an APL, AEL, or similar list. Does not  include  mechanical,  electrical,  ordnance,  or electronic equipments, components, or systems. Equipage   items   are   identified   with   end   use applications aboard ships to the extent that an allowed quantity of the item can be determined on an   individual   ship   basis.   Equipage   items comprise the greater majority of items listed in the AELs and Part IIIB of the COSAL. Chargeable items of equipage are identified in procurement, receipt,  and  consumption  documents  by  the  letter “E” in the second position of the applicable fund code (See NAVSO P-3013). EQUIPMENT—Equipment  includes  any  functional unit of hull, mechanical, electrical, electronic, or ordnance-type  material  that  is  operated  by  itself  or as a component of another system or subsystem, It  is  identified  by  a  Component  Identification Number  (CID)  or  similar  number. EQUIPMENT   AND   EQUIPAGE   REPLACE- MENT   FUNDED   BY   TYPE   COMMANDER AS    CONTROLLED    EQUIPAGE—Durable, high-priced, and essential items of equipment and equipage not designated as controlled equipage. They  are  replaced  only  during  a  ship’s  regular overhaul.  Replacements  of  such  items  (e.g., anchors, shots of chain, chain stoppers, binnacles, AI-3