7-18 When the required part is not in the storeroom, supply then must take appropriate action to obtain the replacement part. You still must return the failed part. Try to turn it in before you receive the replacement part. Entering the failed part into the repair cycle before receiving  the  replacement  makes  the  repaired  part available for reissue that much sooner. REVIEW 2 QUESTIONS Q1. When filling out a requisition, how are the letter O and the number zero differentiated? Q2. What is a priority designator and what is the lowest priority? SUMMARY The supply department at your command plays a vital  role  in  the  efficient  operation   of   the   entire command. It  purchases  all  materials  needed  by  the command—consumables, nonconsumables, and repair parts, as well as food items. If you work in a nonsupply rating, you will be concerned primarily with the procurement of consumable supplies (for example, office supplies and cleaning materials) and repair parts. As a petty officer, you may be required to fill out the proper material requests or ensure  the  requests  are  forwarded  to  the  supply department. This chapter has provided you with some of the information needed for ordering supplies. The  supply  information  in  this  chapter  is  not intended to make you an expert in supply matters. Rather, this section was written to give you a basic understanding of supply matters to help you develop a good working relationship with your supply department. REFERENCES Afloat Supply Procedures, NAVSUP P-485, Naval Supply Systems Command, Arlington, VA, 1993. Afloat Shopping Guide, NAVSUP P-4400, Navy Fleet Material Support Office, Mechanicsburg, PA, 1993. Federal Logistics Data (FEDLOG), NAVSUP P-2002, Naval Supply Systems Command, Arlington, VA, 1994. MILSTRIP/MILSTRAP Desk Guide, NAVSUP P-409, Naval Supply Systems Command, Arlington, VA, 1993. Naval Logistics Library, Compact Disk (CD-ROM), Naval Supply Systems Command, Arlington, VA, 1998. Operating Procedures Manual for MILSTRIP/MILSTRAP, NAVSUP  P-437,  Naval Supply Systems Command, Arlington, VA, 1993. Operational Reports, Naval Warfare Publication, NWP 10-1-10, Chief of Naval Operations, Washington, DC, 1987. Standard Organization and Regulations of the U.S. Navy, OPNAVINST 3120.32C, Chief of Naval Operations, Washington, DC, 1994. Storekeeper  3  &   2,  NAVEDTRA  12650,  Naval Education  and  Training  Program  Management Support Activity, Pensacola, FL, 1996. REVIEW 1 ANSWERS A-1.   An NSN is a 13-digit number used to order supplies from the stock system; it consists of a 4-digit federal supply classification (FSC) code number and a 9-digit national item identification number (NIIN). A-2.   The Afloat Shopping Guide is a resource used for identifying supply items. It is designed to assist fleet and Navy supply support personnel in identifying an NSN for items that do not have a part/reference number. REVIEW 2 ANSWERS A-1.   To avoid confusion between the numeric 0 and the alphabetic  O,  use  the  communication  Ø  for zeroes. A-2. The  priority  designator  (PD)  is  a  two-digit number used to set the level of need; the lowest priority is 15.