Initial authorizede stockage levels of consumable and salvageable items for an organization are to be
computed for predicted consumption based on the number of items employed and/or supported by
an organization within the number of days for which stockage is authorized. In computing Garrison
Operating Stock or Mount-Out, authorized levels can be determined by the requiring Marine Corps
unit by multiplying the replacement factor times the quantity used per equipment, times the
number of end items employed by the using organization, or supported by the service organization,
times the authorized day level expressed in months and divided by 12. Specific formulas and
examples are provided 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 guidelines of MCO 4400.32A. The
following formula replacement factor, X represents actual usage experience (1 year), A
represents the application per equipment, and B represents the number of equipments
W = A X
Inital allowances for maintenance float items (recoverability codes R and D) for the FMF and
appropriate post and stations are as furnished by Initial Issue Actions.
Changes to 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 4600.6.
(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 (Column 4). Indicates the National Stock Number assigned to the item and
will be used for requisitioning purposes.