the supply officer can easily calculate the number of fittings to maintain in stock. If, however, all of these fittings are being replaced by new and more reliable fittings, you should inform supply of this requirement before the need arises. The new fittings can then be stocked before a work delay results because of a lack of parts. To carry this one step further, assume that these new fittings are significantly more reliable and that the replacement requirement is expected to be only one per month. The supply department can then reduce the number of fittings needed for endurance. On receiving this information, the supply department will purge its stock of the old type of fitting and establish a realistic stock of the new item. Routine Requirements Most material procurement falls under the heading   “routine  requirements.”  The  factors discussed above apply chiefly to new ships and to special circumstances. The requirements for an item are initially established when a ship is commissioned or when the item is first stocked. Requirements are reestablished each time your ship undergoes supply overhaul. OPERATING SPACE ITEMS. —Generally, each department is not required to estimate future requirements for repair parts and consumables. Normally  the  supply  department  replenishes stocks either on the basis of authorized allowances or on past demand history. An exception is the replenishment of operating space items. These are items (for example, hand-tools and test kits) that are  required  to  maintain  installed  hull, mechanical, electrical, and ordnance equipment. These items support the mission of the ship. Department heads are responsible for requesting these items for known requirements, but they are not authorized to maintain storeroom stocks that duplicate those of the supply department. Part IIIB of the COSAL is a consolidated list of operating space items. used in the troubleshooting of electronic equip- ment and are not intended to be used as a repair part. READY SERVICE SPARES (RSS). —Ready service spares are repair parts in the custody of the cognizant department head and will be located in the appropriate operating and maintenance spaces under the subcustody of the operating or maintenance personnel. SHIPS WITHOUT SUPPLY CORPS OF- FICERS. —Most ships have one or more Supply Corps officers assigned. Certain small ships, such as minesweepers, have no Supply Corps officer assigned. In this case a line officer heads the supply department. The line officer usually has other duties as well as supply duties, and general storerooms are usually small in ships of this type; therefore, more material is turned over to the cognizant department upon receipt for storage and custody. On ships without a Supply Corps officer,  department  heads  are  responsible  for determining the ship’s requirements for general stores. Each department head must submit a NAVSUP Form 1250-1 or DD Form 1348 to the supply officer for preparation of a DTO (direct turnover) requisition. Each department head is also responsible for maintaining current allowance lists of repair parts pertaining to equipment used by the department. The department head is responsible for maintaining an adequate stock of repair parts to support the equipment of the department, Each time a repair part is used, a NAVSUP Form 1250-1, DD Form 1348, or NAV- SUP Form 1250-2 should be submitted to the supply officer so that a replacement can be requisitioned. Figure 4-2 shows both the Single Line  Item  Consumption/Requisition  Document (Manual), NAVSUP Form 1250-1, and the DOD Single Line Item Requisition System Document (Manual), DD Form 1348. Figure 4-3 shows the Non-NSN Requisition, NAVSUP Form 1250-2. This form consolidates, on one form, information previously submitted on two forms (NAVSUP Form 1250-1 and DD Form 1348-6) for non-NSN requirements. You will play an important role in the reordering of these materials and parts. MAINTENANCE ASSISTANCE MODULES SHIPBOARD MATERIAL REQUEST PRO- (MAMs). —Maintenance assistance modules are CEDURES. —As the division chief you will be in the custody of the cognizant department head responsible for ensuring that the equipment under and located in the appropriate operating and your cognizance is maintained and repaired in a maintenance spaces under the subcustody of the timely  manner.  To  accomplish  this  goal,  you operating or maintenance personnel. MAMs are will need to obtain material from the supply 4-9