Figure 14-2.Levels of supply.
in recurring demand. Figure 14-2 illustrates the
REQUISITIONING OBJECTIVE. This
relationship between the various levels of supply.
In expressing the supply level of any stock
item, four measurements may be used: operating
level, safety level, storage objective, and requisi-
OPERATING LEVEL. This measurement
indicates the quantity of an item that is required
to sustain operations during the interval between
requisitions or between the receipt of successive
shipments of supplies. The operating level should
be based upon the length of the replenishment cy-
cle. For example, if requisitions are submitted
every 2 months, the operating level would be the
quantity of the item that is consumed every 2
months. This level will vary for different items.
SAFETY LEVEL. This measurement in-
dicates the quantity of an item, over and above
the operating level, that should be maintained to
ensure that operations will continue if replenish-
ment supplies are not received on time, or if there
is an unpredictable heavy demand for supplies.
This measurement simply provides a margin of
STOCKAGE OBJECTIVE. This measure-
ment indicates the minimum quantity of a stock
item that is required to support operations. It is
the sum of the operating level and the safety level.
For example, if the operating level of an item is
80 units and the safety level is 20 units, the
stockage objective would be to maintain 100 units
of that item in stock at all times.
measurement indicates the maximum quantity of
a stock item that should be kept on hand and on
order to support operations. It is the sum of the
operating and safety levels and the quantity of an
item that will be consumed in the interval between
the submission of a requisition and the arrival of
The most accurate guide in determining stock
level requirements is past experience as reflected
in accurate stock records. Stock record cards,
which will be discussed in detail later in the
chapter, should be kept current to assist in the
material usage notes. Stock records can tell you
how much of each item has been used in the past.
From this past usage rate, you can make a
reasonable projection of future usage rates.
A requisition is an order from an activity that
is requesting material or services from another ac-
tivity. Except for certain classes of material listed
in NAVSUP P-485 and P-437, all items ordered
from the Navy Supply System, other military in-
stallations, the Defense Logistics Agency, and the
Government Services Administration (GSA) will
be procured using the MILSTRIP system.
MILSTRIP requisitioning is based upon the use