ARMY TM 9-6115-670-14&P C-5 C-4.     EXPLANATION OF COLUMNS (Section IV). a.  NATIONAL STOCK NUMBER (NSN) INDEX. (1) STOCK NUMBER Column.  This column lists the NSN by National item identification number (NIIN) sequence.  The NIIN consists of the last nine digits of the NSN.  When using this column to locate an item, ignore the first four digits of the NSN.  When requisitioning items, use the complete NSN (13 digits). (2) FIG. Column.  This column lists the number of the figure where the item is identified/located.   The figures are in numerical sequence in Section II and Section III. (3) ITEM Column.  The item number identifies the item associated with the figure listed in the adjacent FIG. column.  This item is also identified by the NSN listed on the same line. b.  PART NUMBER INDEX.  Part numbers in this index are listed by part number in ascending alpha numeric sequence. (1) CAGEC Column.  This column lists the CAGEC. (2) PART NUMBER Column.  This column indicates the part number assigned to the item. (3) STOCK NUMBER Column.  This column lists the NSN for the associated part number and manufacturer identified in the part number and CAGEC columns to the left. (4) FIG. Column.  This column lists the number of the figure where the item is identified/located in sections II and III. (5) ITEM Column.  The item number is that number assigned to the item as it appears in the figure referenced in the adjacent figure number column. c.   FIGURE AND ITEM NUMBER INDEX. (1) FIG. Column.  This column lists the number of the figure where the item is identified/located   in Section II and III. (2) ITEM Column.  The item number is that number assigned to the item as it appears in the figure referenced in the adjacent figure number column. (3) STOCK NUMBER Column.  This column lists the NSN for the item.   (4) CAGEC Column.  The Commercial and Government Entity Code (CAGEC) is a 5-digit numeric code used to identify the manufacturer, distributor, or Government agency, etc., that supplies the item.   (5) PART NUMBER Column. Indicates the primary number used by the manufacturer (individual, firm, corporation, or Government activity), which controls the design and characteristics of the item by means of its engineering drawings, specifications standards, and inspection requirements to identify an item or range of items. C-5.    SPECIAL INFORMATION. a.   USABLE ON CODE.  The Usable On Code appears in the lower left corner of the Description column heading.  Usable on Codes are shown as “UOC….” in the Description Column (justified left) on the first line applicable item description/nomenclature.  Uncoded items are applicable to all models.  Identification of the usable on codes in the RPSTL are: Code Used On FPA JTACS (MEP-903B) FPB SICPS (MEP-903A) LTG WIN-T (MEP-903C)