6 TM10-5411-201-24P TO35E4-178-4 publication  pertains,  is  predicted  to  need replacement  in  one  year.  Likewise,  0.004 fl re ects that four out of every thousand in use are predicted to require replacement in one year, while 2.0 shows that everyone in use is predicted to be replaced twice during each year. (a)  Initial  authorized  stockage  levels of consumable and salvageable items for an organization   are   to   be   computed   for predicted consumption based on t e number of items employed and or supported by an organization within the num er of days for which stockage is authorized. In computing Garrison  Operating  Stock  or  Mount-Out, authorized evels can be determined b the l requiring Marine Corps unit by multip ying the replacement factor times the quantity used  per  equipment  times  the  number  of end  items  employed  by  the  using  organi- zation   or   supported   by   the   service organization times the authorized day level expressed  in  and  divided  by  12.  Specific d formulas  and  examples  are  provi  ed  in Marine Corps Order, MCO P4400.79. The replacement factors used in initial  stockage  computations  should  be revised,  if  warranted,  after  significant usage is experienced in accordance with the f guidelines  of MCO 4400.32A. The following ormula replacement factor, “X” represents actual   usage   experience   (1   year),   “A” h represents  t  e  application  per  equipment, and   “B”   represents   the   number   of equipments supported. (b)   Initial   allowances   for   main- tenance  float  items  (recoverability  codes "R" and "D") for the FMF and appropriate post and stations are as furnished by Initial Issue Actions. C h a n g e s    t o maintenance replacement  rates  resulting  from  actual usage   may   require   recomputation   of maintenance  float  allowances  by  holding units. Any   required   recomputation   of maintenance float allowances will be made in accordance with MCO 4000.6. (c)  The  replacement  factor  for  same as (S A) items is indicated upon the first appearance   of   the   item   in   the   major combination,  component  or  assembly. d.   (ALL)   National   Stock   Number Number assigned to the item and will be used for requisitioning purposes. e.  (ALL)  Description.  Indicates  the Federal  item  name  and  any  additional descriptions   of   the   item   required.   The abbreviation “we" when used as part of the nomenclature, indicates that the National Stock  Number  includes  all  armament, equipment,  accessories  and  repair  parts issued  with  the  item.  A  part  number  or other reference number is followed by the applicable  five  digit  Federal  Supply  Code for  manufacturer  in  parentheses.  If  two reference   numbers   and   Federal   Supply Codes for manufacturer are listed, the first listing refers to the Department of Defense Drawing Number, the second listing refers to the actual part manufacturer. Items that are  included  in  kits  and  sets  are  listed below the name of the kit or set with the quantity  of  each  item  in  the  kit  or  set indicated  in  the  quantity  incorporated  in unit  column. f.   (ALL)   Unit   of   Measure   (U/M). Indicates the standard of the basic quantity of the listed item as used in performing the actual maintenance function. This measure is   expressed b y    a    t w o - c h a r a c t er alphabetical  abbreviation  (e.g.,  ea.  in.  pr. etc.). When the unit of measure differs from the unit of issue, the lowest unit of issue that will satisfy required units of measure will be requisitioned. g.   (ALL)   Quantity   Incorporated   in Unit.  Indicates  the  quantity  of  the  item used   in   the   assembly   group. appearing  in  this  column  in  lieu  of  a quantity indicates that a definite quantity cannot  be  indicated  (e.g.  shims,  spacers, etc.). h.   (MC)   Quantity   Per   Equipment. Indicates   the   consolidated   quantity   of   a