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     Congressional Research Service
'    Inforig th legisi ative debate since 1914


October 14, 2016


Defense Primer: Naval Forces

Naval Forces Refers to Both the Navy
and Marine Corps
Although the term naval forces is often used to refer
specifically to Navy forces, it more properly refers to both
Navy and Marine Corps forces, because both the Navy and
Marine Corps are naval services. For further discussion, see
Defense Primer: Department of the Navy. For a
discussion of the Marine Corps that focuses on its
operations as a ground-combat force, see Defense Primer:
Ground Forces.

U.S. Strategy and Naval Forces
U.S. naval forces give the United States the ability to
convert the world's oceans-a global commons that covers
more than two-thirds of the planet's surface-into a
medium of maneuver and operations for projecting U.S.
power ashore and otherwise defending U.S. interests around
the world. The ability to use the world's oceans in this
manner-and to deny other countries the use of the world's
oceans for taking actions against U.S. interests-constitutes
an immense asymmetric advantage for the United States.

As discussed elsewhere (see Defense Primer: Geography,
Strategy, and U.S. Force Design), the size and composition
of U.S. naval forces reflect the position of the United States
as a Western Hemisphere power with a goal of preventing
the emergence of a regional hegemon in one part of Eurasia
or another. As a result, the U.S. Navy includes significant
numbers of aircraft carriers, nuclear-powered attack
submarines, large surface combatants, large amphibious
ships, and underway replenishment ships.

Navy Ship Types
The Navy's ballistic missile submarines (SSBNs) are
dedicated to performing a singular mission of strategic
nuclear deterrence. The Navy's other ships, which are
sometimes referred to as the Navy's general-purpose ships,
are generally multimission ships capable of performing a
variety of missions other than strategic nuclear deterrence.
The principal types of general-purpose ships in the Navy
include attack submarines (SSNs); aircraft carriers
(CVNs); large surface combatants, meaning cruisers
(CGs) and destroyers (DDGs); small surface combatants,
meaning frigates (FFs), Littoral Combat Ships (LCSs),
patrol craft (PCs), and mine warfare (MIW) ships;
amphibious ships, whose primary function is to transport
Marines and their equipment and supplies to distant
operating areas and support Marine ship-to-shore
movements and Marine operations ashore; combat logistics
force (CLF) ships, which perform underway replenishment
(UNREP) operations, meaning the at-sea resupply of
combat ships; and other support ships of various types.

The Navy's aircraft carriers embark multimission carrier air
wings (CVWs) consisting of 60+ aircraft-mostly fixed-


wing aircraft, plus a few helicopters. Each CVW typically
includes 40 or more strike fighters that are capable of air-to-
ground (strike) and air-to-air (fighter) combat operations.

Size of the Navy
The total number of ships in the Navy is a one-dimensional
metric that leaves out many other important factors bearing
on naval capability. Notwithstanding this limitation,
observers often cite the total number of ships in the U.S.
Navy as a convenient way of summarizing the Navy's
capabilities.

The quoted size of the Navy reflects the battle force ships
counting method, which is a set of rules for which ships
count (or do not count) toward the quoted number of ships.
The battle force ships counting method was established in
the early 1980s and has been modified by legislation in
recent years. Essentially, it includes ships that are readily
deployable overseas, and which contribute to the Navy's
overseas combat capability. The Naval History and
Heritage Command maintains a database on numbers of
ships in the Navy from 1886 to the present. (It is available
here: https ://www.history.navy.mil/research/histories/ship-
histories/us-ship-force-levels.html.) Since this database
extends back to 1886, it uses a different counting method
that is more suitable for working with older historical data.
This alternate counting method produces, for the 1980s
onwards, figures for the total size of the Navy that are
different than the figures produced by the battle force ships
counting method. For this reason, using figures from the
NHHC database to quote the size of the Navy in recent
years can cause confusion.

Navy Force-Level Goal
The Navy determines its force-level goal-the size and
composition of the fleet it would like to reach and maintain
in coming years-through a Force Structure Analysis
(FSA). For each type of ship, the FSA calculates the
number required for warfighting, and the number required
for maintaining day-to-day forward-deployed presence
overseas. Navy officials then work with these two
calculations to select a final required number for each ship
type. The Navy's current force-level goal is to reach and
maintain a fleet of 308 battle force ships, including 48
SSNs, 11 CVNs, 84 large surface combatants, 52 smaller
surface combatants, and 34 amphibious ships. FSAs are
conducted every few years. The Navy is currently
conducting a new FSA that will lead to a revised force-level
goal.

Actual Size of the Navy
The size of the Navy in recent years has generally ranged
between 270 and 290 battle force ships. The current total
figure can be found here: http://www.navy.mil/navydata/
nav-legacy.asp?id=146. The navy projects that at the end


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