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When transportation and stock positioning decisions are well integrated,
enabling the resulting distribution channels to be used in ways that leverage
their strengths, the channels become complementary elements of an effective,
efficient global supply chain. The Department of Defense's inventory locations
and transportation channels combine to form five major distribution channels
for materiel shipped from the Continental United States (CONUS) to other
theaters:
"* Military air with shipments consolidated at distribution centers
(MILALOC).
"* Military air with shipments consolidated at airports (MILAIR).
Commercial express small package delivery or Worldwide Express
" Ocean lift to theater inventory with theater distribution ("Surface-
theater").
"o Ocean lift with transshipment to the unit ("Surface-direct").
Distribution Channel Characteristics and Performance
These channels offer varying levels of service and shipping cost, as
demonstrated by service to units in Iraq. MILALOC, when materiel is issued
from the primary distribution center supporting a unit/theater, offers fast
service at a moderate cost. The speed is similar to that of WWX, which costs
much more than MILALOC in undeveloped theaters. Surface-theater also has
similar speed, at about half the cost of MILALOC. So, for example, to support
customers in Iraq, there are three fast channels at different transportation "price
points." In contrast, when the shipment is issued from the nonprimary
distribution center, MILAIR and MILALOC are slower, with moderate
transportation cost. Surface-direct is very slow but also very inexpensive.
The performance and transportation costs for each channel are not alone
sufficient to determine whether one channel or another should be used.
Rather, there are "prerequisites" for either feasibility or effectiveness. For
MILALOC to be effective, a unit has to need enough sustainment materiel for
reasonably full air pallets to be shipped to it on a frequent basis; moreover, the
materiel needs to be positioned at the primary distribution center supporting
the unit. Also, a small percentage of items are not eligible to be packaged for
air shipment at distribution centers, precluding the use of MILALOC for these
items. WWX is currently limited by contract to items 150 lbs. or less.
When considering sealift combined with centralized theater inventory, the
marginal cost of additional inventory must be considered along with
transportation cost. Good candidates for sustainment from centralized theater
inventory with replenishment by sea are iterns that have a high ratio of weight
(a proxy for transportation cost) to their procurement cost. Total sustainment
cost is reduced when high weight-to-cost materiel is stocked in theater and
replenished by ship. Thus, surface-theater and MIIALOC offer similar
performance but are uniquely cost-effective for different items. Finally, surface-
direct is too slow and variable to be used except for cases in which delivery
timing is not important or planning offers a long lead time.
Ideal Distribution Channel Roles
The combinations of performance, transportation cost, inventory cost,
and conditions under which the channels are feasible and effective lead to ideal
roles for each. Surface-direct is best for relatively low-cost items ordered in
bulk either for time-insensitive needs or when the unit can plan far in advance.
Surface-theater is the best way to provide high-volume, high-weight-to-cost
items to all units in theater., Time-sensitive demands for items for which it is
1 For units in Iraq, theater inventory has not been providing a time advantage over
MILALOC from the primary distribution center. Thus, it has primarily offered a
transportation cost savings. However, if in another theater it were to have a time advantage,
then it could be advantageous to expand the breadth of items to improve customer support
effectiveness. Similarly, it can provide a time benefit for items that cannot use MILALOC
from the primary distribution center or WWX. In such cases, if the item does not meet the
weight-to-cost criteria for theater inventory, then it may still be beneficial to hold it in
theater inventory but with air-based replenishment to hold down inventory requirements.
not cost-effective from a total cost perspective to hold in theater inventory
should be sent by air from CONUS.
MILALOC is fast and relatively inexpensive and is the ideal choice for
moderate- to high-volume units when stock is positioned to a large degree at
the unit's primary supporting distribution center. Even for these units, though,
MILALOC cannot handle all items, requiring a failback to MILAIR. Also,
some stock will not be in the right place for MILALOC customers; in this
situation, WWX becomes. an alternative for fast, reliable distribution. For units
with low volume or stock positioning that will not support effective
MILALOC, the only way to get fast, reliable distribution is WWX. For items
over 150 lbs. sourced from within CONUS, though, these units then have to
rely on relatively slow MILAIR.
Thus, customers get responsive distributionfast and reliable-and total
system costs are minimized when high-volume, high-weiweight-to-cost items are
stocked in theater with replenishment by ship, most items for higher-volume
customers are stocked at their supporting distribution centers, and customers
plan activities involving large volumes of inexpensive materiel far in advance.
Ideal Roles vs. Current Sustainment Structure: Iraq as a Case Study
Through a gradual evolution, the sustainment structure for Iraq has
moved toward this supply chain model. To illustrate this, we look at the
sustainment channels serving example units representing different unit types in
Iraq, and we also look at whether surface-theater is being employed for high-
volume, high-weight-to-cost items.
"When shipping volume from a primary distribution center in CONUS is
high enough-driven by the combination of unit sustainment demand volume
and stock positioning effectiveness, the best distribution choice for items
shipped from CONUS to units in Iraq is MIIALOC. To determine whether a
unit demands sufficient volume, we first look at total volume per day. The
next check is to see how much of these items in terms of weight are issued from
the unit's primary distribution center in CONUS. The third check is to see
how much of the materiel shipped from the primary distribution center is
MILALOC-eligible. If the result of these three checks is that there is sufficient
volume for approximately daily pallets from a unit's primary distribution
center, then MILALOC should be employed.
For an Army heavy brigade combat team (BCT) example, all three
MILALOC criteria are fulfilled. Thus, as it should be, MILALOC is the
primary CONUS channel for the BCT. Because the BCT also requests many
big, heavy items, surface-theater is also an appropriate major channel.
An illustrative Army combat aviation brigade (CAB) has relatively high
volume, but the stock positioning of the items it needs meshes only moderately
with the use of MILALOC. So while it uses MIIALOC, it is also supported
with WWVX for small items. WVWX is its highest-frequency channel.
An illustrative U.S. Air Force base supply unit has relatively low volume
and similar stock positioning at the primary distribution center as the Army
CAB. This combination prevents consideration of MILALOC for this unit.
Thus, the primary mode from CONUS is WWX, with MILAIR as the fallback
for larger items.
An illustrative U.S. Marine Corps aviation logistics unit actually has
relatively high volume, but a small fraction of its shipments in terms of weight
are from the primary distribution center. This would make MILALOC
ineffective. Hence, it too uses aVX as the primary mode. Unlike the other
units, it does not utilize theater inventory.
The sustainment structure for Iraq also generally reflects the ideal supply
chain model when viewed from an item perspective. For the top 100 items by
shipping weight, most with high weight-to-cost ratios are now stocked in
theater. However, forward theater inventory remains more hit and miss for the
next 900 items.
Improvement Opportunities
There are near-term opportunities for improved, cost-effective
sustainment by more effectively leveraging the complementary nature of the
five available distribution channels.
"o First, better stock positioning to improve MILALOC effectiveness and
utilization would reduce overall distribution times.
"* Support to MILALOC units can be improved by using WWX to ship
small, critical items not at the primary distribution center, after
improving stock positioning.
* The potential for heavier WWX weight limits should also be explored to
mitigate the effects of relatively slow MILAIR performance for units for
which WWX is the primary channel.
* Still, there will continue to be critical, large items that demand MILAIR.
Support for these items will continue to suffer unless MILAIR is
improved, an alternative channel such as a special charter is established,
or forward stock positioning is leveraged.
* :Additionally, there remain some high-volume, high-weight-to-cost items
that should be stocked in centralized theater inventory to reduce total
costs.
In conclusion, the five distribution channels discussed in this report are
not redundant, but rather play important, complementary roles in providing
cost-effective support to soldiers, sailors, airmen, and marines around the
world. With these roles well understood, all of the organizations involved in
their operation and use will be better able to integrate the supply chain and
determine the best paths to improved support.