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Updated October 25, 2021
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.
Workd 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 have chosen to pursue, as a key
element of U.S. national strategy, a goal of preventing the
emergence of regional hegemons in Eurasia. This objective
reflects a U.S. perspective on geopolitics and grand strategy
developed by U.S. strategists and policymakers during and
in the years immediately after World War II that
incorporates two key judgments:
 that given the amount of people, resources, and
economic activity in Eurasia, a regional hegemon in
Eurasia would represent a concentration of power large
enough to be able to threaten vital U.S. interests; and
 that Eurasia is not dependably self-regulating in terms of
preventing the emergence of regional hegemons,
meaning that the countries of Eurasia cannot be counted
on to be fully able to prevent, through their own choices
and actions, the emergence of regional hegemons, and
may need assistance from one or more countries outside
Eurasia to be able to do this dependably.
Preventing the emergence of regional hegemons in Eurasia
is sometimes also referred to as preserving a division of
power in Eurasia, or as preventing key regions in Eurasia
from coming under the domination of a single power, or as
preventing the emergence of a spheres-of-influence world,
which could be a consequence of the emergence of one or
more regional hegemons in Eurasia. The Trump
Administration's December 2017 national security strategy
document states that the United States will compete with
all tools of national power to ensure that regions of the
world are not dominated by one power.
Although U.S. policymakers do not often state explicitly in
public the goal of preventing the emergence of regional
hegemons in Eurasia, U.S. military operations in World
War I and World War II, as well as numerous U.S. military
wartime and day-to-day operations since World War II (and
nonmilitary elements of U.S. national strategy since World
War II), appear to have been carried out in no small part in
support of this goal.
U.S. Strategy and Force Design
The goal of preventing the emergence of regional hegemons
in Eurasia is a major reason why the U.S. military is
structured with force elements that enable it to deploy from
the United States, cross broad expanses of ocean and air

space, and then conduct sustained, large-scale military
operations upon arrival in Eurasia or the waters and
airspace surrounding Eurasia. 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 (as opposed to non-nuclear-powered)
attack submarines, large surface combatants, large
amphibious ships, and underway replenishment ships.
 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 Eurasia or the oceans and
airspace surrounding Eurasia, the United States also stations
significant numbers of forces and supplies in forward
locations in Europe, the Persian Gulf, and the Indo-Pacific.
On February 4, 2021, President Biden announced that
Defense Secretary Austin will be leading a Global Posture
Review of our forces so that our military footprint is
appropriately aligned with our foreign policy and national
security priorities. DOD stated that the review will
examine the U.S. military's footprint, resources and
strategies and will use American defense strategy and
look where service members are based, and if this is the
best place to be based.
Comparing US. Forces to Other
Countries Forces
The United States is the only country in the world that
designs its military to depart one hemisphere, cross broad
expanses of ocean and air space, and then conduct
sustained, large-scale military operations upon arrival in
another hemisphere. 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 regions of that hemisphere. (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

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