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Congressiona Research Service
Informr g the Iegaslaitive debate since 1914


S


                                                                                                  October 14, 2016

Defense Primer: Geography, Strategy, and U.S. Force Design


World geography is an influence on U.S. strategy, which in
turn helps shape the design of U.S. military forces.

World Geography and U.S. Strategy
Most of the world's people, resources, and economic
activity are located not in the Western Hemisphere, but in
the other hemisphere, particularly Eurasia. In response to
this basic feature of world geography, U.S. policymakers
for the last several decades appear to have chosen to pursue,
as a key element of U.S. national strategy, a goal of
preventing the emergence of a regional hegemon in one part
of Eurasia or another, on the apparent grounds that such a
hegemon could represent a concentration of political,
economic, and military power strong enough to threaten
core U.S. interests. Although U.S. policymakers do not
often state this apparent goal explicitly in public, U.S.
military operations in recent decades-both wartime
operations and day-to-day operations-appear to have been
carried out in no small part in support of this goal.

Uo.S Strategy and Force Design
The goal of preventing the emergence of a regional
hegemon in one part of Eurasia or another appears to be a
major reason why the U.S. military is structured with force
elements that enable it to cross broad expanses of ocean and
air space and then conduct sustained, large-scale military
operations upon arrival. Force elements associated with this
objective include, among other things,

* an Air Force with significant numbers of long-range
   bombers, long-range surveillance aircraft, and aerial
   refueling tankers;

* a Navy with significant numbers of aircraft carriers,
   nuclear-powered attack submarines, large surface
   combatants, large amphibious ships, and underway
   replenishment ships; and

* significant numbers of long-range Air Force airlift
   aircraft and Military Sealift Command sealift ships for
   transporting ground forces personnel and their
   equipment and supplies rapidly over long distances.

Consistent with a goal of being able to conduct sustained,
large-scale military operations in distant locations, the
United States also stations significant numbers of forces
and supplies in forward locations in Europe, the Persian
Gulf, and the Asia-Pacific.

Comparing U.S. Forces to Other
Countries' Forces
The United States is the only country in the world that
designs its military to cross broad expanses of ocean and air
space and then conduct sustained, large-scale military
operations upon arrival. The other countries in the Western


Hemisphere do not design their forces to do this because
they cannot afford to, and because the United States is, in
effect, doing it for them. Countries in the other hemisphere
do not design their forces to do this for the very basic
reason that they are already in the other hemisphere, and
consequently instead spend their defense money primarily
on forces that are tailored largely for influencing events in
their own local region. (Some countries, such as Russia,
China, the United Kingdom, and France, have an ability to
deploy forces to distant locations, but only on a much
smaller scale.)

The fact that the United States designs its military to do
something that other countries do not design their forces to
do can be important to keep in mind when comparing the
U.S. military to the militaries of other nations. For example,
the U.S. Navy has 11 aircraft carriers while other countries
have no more than one or two. Other countries do not need
a significant number of aircraft carriers because, unlike the
United States, they are not designing their forces to cross
broad expanses of ocean and air space and then conduct
sustained, large-scale military operations upon arrival.

As another example, it is sometimes noted, in assessing the
adequacy of U.S. naval forces, that U.S. naval forces are
equal in tonnage to the next dozen or more navies
combined, and that most of those next dozen or more navies
are the navies of U.S. allies. Those other fleets, however,
are mostly of Eurasian countries, which do not design their
forces to cross to the other side of the world and then
conduct sustained, large-scale military operations upon
arrival. The fact that the U.S. Navy is much bigger than
allied navies does not necessarily prove that U.S. naval
forces are either sufficient or excessive; it simply reflects
the differing and generally more limited needs that U.S.
allies have for naval forces. (It might also reflect an
underinvestment by some of those allies to meet even their
more limited naval needs.)

Measuring the Sufficiency of U.S. Forces
Countries have differing needs for military forces. The
United States, as a country located in the Western
Hemisphere with a goal of preventing the emergence of a
regional hegemon in one part of Eurasia or another, has
defined a need for military forces that is quite different
from the needs of countries that are located in Eurasia. The
sufficiency of U.S. military forces consequently is best
assessed not through comparison to the militaries of other
countries (something that is done quite frequently), but
against U.S. strategic goals.


www.crs.gov 1 7-5700

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