US nuclear weapons capability【Overview】
The nuclear posture review (NPR) conducted by the Biden administration, was initially presented as an outline toCongress on March 28, 2022 (U.S. Department of Defense 2022-1), and the full text was publicly released on
October 27, 2022 (U.S. Department of Defense 2022-2). The expected provisions of "no first use" or "sole purpose"
did not make it into the review due to opposition from countries such as Japan and non-nuclear NATO members.
However, the review did include the retirement of the B83-1 free-fall bomb and the cancellation of the sealaunched cruise missile plan launched under the Trump administration. The expression “our commitment to
reducing the role of nuclear weapons and reestablishing our leadership in arms control” was included, and thedifference to the Trump administration was visible. With regard to the point that “the United States would only
consider the use of nuclear weapons in extreme circumstances to defend the vital interests of the United States
or its allies and partners,” this is basically the same stance as the NPR conducted by the Obama administrationin 2010 (U.S. Department of Defense 2010-1). The wording in the Biden administration’s NPR that “maintaining
a safe, secure, and effective nuclear deterrent and strong and credible extended deterrence commitments,
remain a top priority for the Nation,” indicates there is no change in the policy of placing nuclear deterrence as apillar of security.
The modernization of the United States’ nuclear weapons continues. The broad framework of the nuclear weapon
modernization plan under the Obama administration (2009 to 2017) was continued by the Trump administration(2017 to 2021), but there were a few important changes. The first was the partial replacement of submarinelaunched ballistic missile (SLCM) warheads to low-yield warheads, the second was the revival of nuclear-armed
sea-launched cruise missiles (SLCM-N), and the third was the development of the newly designed W93 warhead
for the new generation of SLBM. With regard to the low-yield SLBM warheads, the W76-1 warheads wereconverted to W76-2 warheads by reducing their yield to 8 kt (Kristensen, Hans M. & Korda, Matt 2020), and were
deployed on the strategic submarine USS Tennessee (SSBN-734) (U.S. Department of Defense2020, FAS
Strategic Security Blogs 2020). This plan is thought to have been completed with deployment of 25 warheads.
The revival of the second submarine-launched cruise missile (SLCM-N) began with design investigations during
the Trump administration, but the Biden administration canceled the program (U.S. Department of Defense 20222). However, the U.S. Congress allocated a budget of $45 million for the fiscal year 2023. A similar scenario is
expected to continue into the fiscal year 2024, with ongoing negotiations between the federal Congress and the
Biden administration regarding the revival of the SLCM-N (Stephen Young 2023). With regard to the new W93
warhead development plan, it has been incorporated in the Biden administration’s FY2023 budget proposal(NNSA 2022).
The Biden NPR presents several specific modernization plans. In the land-based component, funding is provided
for the replacement program to transition Minuteman III missiles to the Sentinel system, as outlined in the futureyear plans for 2023-2027. In the sea-based component, sufficient funding is allocated to support the Columbiaclass submarine program, which will replace the Ohio-class fleet starting in 2030. In the air-based component,
full funding is provided for the B-21 Raider bomber, which will replace the B-2A Spirit fleet. Additionally, full-scale
production of the new guided B61-12 bomb, a non-strategic nuclear weapon, began in the fall of 2022 with theaim of completion by 2026 (Kristensen, Hans M. & Korda, Matt 2023-1).
Currently, the U.S. has around 3,708 nuclear warheads on 800 ballistic missiles and aircraft. Of these the amountof deployed nuclear warheads is composed of 1,670 strategic and 100 non-strategic warheads deployed inEurope, 1,770 in total (Kristensen, Hans M. & Korda, Matt 2023-1), a increase of 26 from last year. The
breakdown of deployed strategic war heads is 400 ICBMs, 970 SLBMs and 300 on aircraft such as bombers. The
number of strategic nuclear warheads, 1,670, is greater than the 1,420 strategic nuclear warheads in operational
1 / 8

deployment registered under the New START as on September 1, 2022 (U.S. Department of State 2022). One
reason for the discrepancy may be due to the New START Treaty practice of counting only one warhead per
strategic bomber, as opposed to accounting for all other warheads stored on-base where bombers are stationed.
Besides these, there exist some 1,938 warheads in reserve, bringing the total size of the stockpile for military use
to a combined 3,708 warheads. In addition to these there are around 1,536 retired warheads awaiting
dismantlement, amounting to a grand total of 5,244, an overall decline of 181 from last year.
The United States has traditionally been considered to be the most transparent (though insufficiently so) of thenuclear-weapon states. In May 2010, the U.S. Department of Defense issued a fact sheet on its nuclear stockpile,which reported 5,113 warheads as of September 2009 (U.S. Department of Defense 2010-2). Since 2014, it has
been updated almost annually. Subsequently, a state of non-publication proceeded over the course of the Trumpadministration, but this has been improved under the Biden administration and on October 5, 2021 there was anannouncement that as of September 2020 the United States’ stockpile of nuclear warheads was 3,750 (U.S.
Department of State 2021).
The U.S. is continuing with subcritical experiments without ratifying the Comprehensive Nuclear-Test-Ban Treaty.
The Trump administration also conducted Vega in December 2017 (Maskaly, Garry R. 2018), Ediza in February
2019 (LLNL 2019) and Nightshade A in November 2020 (LLNL 2020), subcritical experiments (SCEs) using adownsized mockup of the otherwise identical design. Under the Biden administration, too, tests were
implemented with the Nightshade B on June 22, 2021 (Anaya, Lillian Marie & Adkins, Kenneth Brian 2021-1),
and with the Nightshade C on September 16, 2021 (Anaya, Lillian Marie & Adkins, Kenneth Brian 2021-2). Thisis part of the Red Sage campaign, which aims to measure the dynamic properties of plutonium, and it is expectedthat Wolf's Bane and Hemlock will follow as successors to Nightshade after 2025 (Nevada National Security Site2020). It should be noted that in recent years, information regarding subcritical nuclear experiments is no longer
being publicly released.
The United States had planned the first Minuteman III ICBM test launch for March 2, 2022, but it was canceled
due to concerns of escalating tensions caused by Russia's invasion of Ukraine (Kristensen, Hans M. & Korda, Matt
2022-1). Subsequently, the second test was postponed to August 16, 2022, to avoid heightening tensions with
China, which conducts military exercises near Taiwan, during then House Speaker Nancy Pelosi's visit to Taiwan(Kristensen, Hans M. & Korda, Matt 2023-1). The third test took place on September 7, 2022, after providing priornotice to Russia (Kristensen, Hans M. & Korda, Matt 2023-1). On the other hand, the Trident II SLBM test launchoccurred on June 17, 2022, when the submarine "Kentucky" conducted a four-missile test (Kristensen, Hans M.
& Korda, Matt 2023-1, US Strategic Command 2022). However, it should be noted that this information may not
be exhaustive.

2 / 8

The red numbers represent an increase in the number of warheads since last year,
while the blue numbers represent a decrease.
Updated: June 1, 2023
Type / designation

Missile/bomb

No. ofwarheads perweaponNo. ofwarheads

Types ofnuclearwarheads

Yield (kt)Year first
deployed

Remarks

Deployable warheads （Deployed＋Reserve）

3,708

Deployed

1,021

1,770

1)

400

400

2)

Intercontinental ballistic
missile (ICBM)
Minuteman III Mk-12A a)
Minuteman III
Mk-21/SERV

200

1

200

W78

335

1979

200

1

200

W87

300

2006

Submarine-launchedballistic missile (SLBM)

221

Trident II D5 Mk-4A b)

128

970
4~5

3)

561

W76-1

100

2008

8

2019

455

1990

Trident II D5 Mk-4A

6

4~5

25

W76-2 4)

Trident II D5 Mk-5

87

4~5

384

W88

Strategic bomber
payloads

400

Cruise missile d)

200

Strategic nuclear bombe)Non-strategic nuclear
and airborne weapons f)

Reserve / Nondeployed

100

100

400
1
1

1

200
100

100

Carried by the Ohio-classnuclear submarine c)
5)

W80 - 1

5 - 150

1961

B61-7

10 - 360

1985

B61-11

400

1997

B83-1

low - 1,200

1993

B61-3

0.3 - 170

B61-4

0.3 - 50

1979

Carried by the B-52H g)
Carried by the B-2A h)

6)

1,938

7)

ICBM

400

8)

SLBM

950

9)

Air-launched systems(Bombers, etc.)

588

Strategic bomber
PayloadNon-strategic nuclear
weapons

488
100

Retired warheads awaiting
dismantlement, etc.

1,536

Total inventory

5,244

10)
B61-3/4

11)
12)©RECNA Nuclear Warhead Data Monitoring Team3 / 8

【Notes】
1)

Based on the latest estimates of strategic deployment (Kristensen, Hans M. & Korda, Matt 2022-2). The total estimated numbersof strategic nuclear weapons are 400 for ICBMs, 944 for SLBMs and 300 allotted for bombers, amounting to 1,644 in all(Kristensen, Hans M. & Korda, Matt 2022-1).

2)

The United States has announced that the number of deployed ICBMs will be 400 on completion of New START implementation(U.S. Department of Defense 2014). While the Minuteman III Mark 12A used to carry a maximum of three W78 warheads, singlewarhead modification is reported to have been complete by 2014 (NTI 2014), so deployed warheads are estimated to be 400. This
matches the latest estimate (Kristensen, Hans M. & Korda, Matt 2022-1).

3)

The United States announced that it would have 240 SLBMs deployed on completion of the New START implementation (U.S.
Department of Defense 2014). This required cutting back the 24 launch tubes on each of the twelve strategic nuclear submarines
in operational deployment to 20 launch tubes. This process was complete by the end of 2017, bringing down the number of
warheads to 240 (Kristensen, Hans M. & Korda, Matt 2019). According to the New START Treaty data as of September 1, 2020
(U.S. Department of State 2020), SLBMs in deployment numbered 230, with no direct reference to warheads involved. Based on
the latest estimates (Kristensen, Hans M. & Korda, Matt 2022-1) and with reference to the latest September 2021 START data weestimate the number of deployed SLBM is 944 (Kristensen, Hans M. & Korda, Matt 2022-1, Kristensen, Hans 2021-1). It appears
that all of the 384 W88 warheads are deployed. In addition, as shown in Note 4, 25 W76-2 have been manufactured, as an
upgraded version of the M76-1. Subsequently, the number of W76-1 warheads is around 535, the sum obtained by subtractingfrom 944 the 384 W88s and the 25 new W76-2s. The number of Mk-4A and Mk-5 missiles has been proportionally distributed
according to the number of SLBM (221).

4) On February 22, 2019, the Pantex Plant completed the first production unit of the W76-2 warhead, a variant of the W76-1 warhead
with reduced yields ranging 8 kilotons. 25 W76-2s were transferred to the Navy by the end of FY2019 (Kristensen, Hans M. & Korda,
Matt 2021-1) .
5)

Of nuclear warheads allocated to bombers in operational deployment, about 300 are estimated to be strategic and 100, nonstrategic. Those nuclear-capable bombers are 20 B-2s and 46 B-52Hs (Kristensen, Hans M. & Korda, Matt 2021-1). Since the B2A can carry up to 16 nuclear bombs, our estimate is a total 320. The B-52H carries up to 20 cruise missiles but, considering
operational conditions, we estimate their allocation to be 530 warheads. Of these, we see about 100 nuclear bombs and about
200 cruise missiles in operational deployment. 100 weapons are deployed in five European countries for use by NATO forces.

6)

These are deployed as below at six bases in the five nations of Belgium, Germany, Italy, the Netherlands and Turkey (Kristensen,
Hans M. & Korda, Matt 2021-1, Kristensen, Hans 2021). The 60 weapons shown in the table below as “joint responsibility withrecipient nation” are NATO-shared nuclear bombs.

U.S. Nuclear Weapons in Europe (As of October 2022)
Cou n t ry

Ai r Bas e

Ai rc af t

Beigium
Germany

Kleine Brogel
BuchelAvianoGhedi
VolkelIncirlika

F-16
Belgium
PA-200 Tornado Germany
F-16
United States
PA-200 Tornado Italy
F-16
Netherland
None
United States

Italy
Netherland
Tukey
Tot alH os t n at i on

N o. of Warheads

15
15
20
15
15
20
100

Source: Federation of American Scientists
https://fas.org/publication/steadfast-noon-exercise-and-nuclear-modernization/

4 / 8

7)

In March 2018, the Pentagon announced that, as of the end of September 2017, the U.S. stockpile in deployment and reserve
consisted of 3,822 warheads (U.S. Department of Defence 2018). In addition, the Department of State announced that as of theend of September 2020 the combined total of the stockpile in deployment and reserve was 3,750 (U.S. Department of State 2021).
Based on this figure, we have applied a retirement rate and estimate the current stockpile to be 3,708 warheads. Subtracting
1,744 in operational deployment, we arrived at a reserve storage of 1,964 (Kristensen, Hans M. & Korda, Matt 2022-1).

8)

These are W78 warheads made redundant by the single-warhead modification on the Minuteman III Mark-12A.

9)

The number is obtained by subtracting the number of warheads in deployment (944) from the total number of SLBM warheads(1,920). The figure includes arsenal for two Ohio-class nuclear submarines in overhaul (20 missiles, some 170 warheads) andhundreds of the W76-0s replaced by W76-1s.

10) Of all nuclear weapons allocated to strategic bombers, those stored not on other air force bases but in central storage at Kirtland
Air Force Base (Kristensen, Hans M. & Korda, Matt 2021-1).
11) They are stockpiled in central storage at Kirtland Air Force Base, New Mexico. This consists of B61-3 and B61-4 warheads only,with all B61-10s retired by the end of September 2016 (NNSA 2017). They may be deployed in future on fighter bombers to assist
allies outside of Europe.
12) According to the January 2017 fact sheet, there are approximately 2,800 nuclear warheads are currently retired and awaiting
dismantlement (The White House 2017). Following this announcement, 354 were dismantled by the end of September 2017 (The
Department of Defence 2018). Assuming further retirement and dismantlement, those warheads retired or awaiting
dismantlement are estimated to be 1,717. In addition, 20,000 plutonium pits for primary detonation and 4,000 for secondary
detonation are thought be stockpiled at the Pantext (Texas) and Y-12 plants (Tennessee) (Kristensen, Hans M. & Korda, Matt 20212).

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a)Intercontinental ballistic missile (ICBM)
Designation
Propulsion
No. of warheads
Launch platform
Specifications
Range
Circular error probability

:
:
:
:
:
:
:

Minuteman III
Three-stage solid-propellant
Maximum 3 warheads
Silo
Length 18m, Diameter 1.7m, Weight 32.2tons
Over 9,600km
110ｍ

b)
Submarine-launched ballistic missile (SLBM)
Designation
Propulsion
No. of warheads
Specifications

:
:
:
:

Trident II D5
Three-stage solid-propellant
Maximum 8 warheads
Length 13.4m, Diameter 1.85m, Weight 59tons
7 / 8

RangeCircular error probability
Submarine:::

6,500km120m
Ohio-Class strategic nuclear submarinec)Strategic nuclear submarine
Model
Submerged speed
No. of tubes
Specifications
No. of submarines in service

:
:
:
:
:

Ohio-Class
25knot (46km/h)
24
Length 171m, Width 13m, Emissions 16,600tons
14

:
:
:
:

AGM-862,500kmLength 6.29m, Diameter 0.62m, Weight 1.4tons
B52-H Stratofortress

:
:
:
:

Gravity bombd)Air-launched cruise missile
Designation
Range
Specifications
Carried bye)Strategic nuclear bomb
Type
Range
Specifications
Carried by

B-2A Spiritf)Air-launched, Non-strategic nuclear weapons
Designation
Specifications
Carried by
Remarks::::

Gravity bomb B61-3, B61-4
Length 3.56m, Diameter 0.33m, Weight 0.32tons
F-15E, F-16, Tornado
Deployed in Europe, shared with NATO forces.

:
:
:
:
:
:

B-52H Stratofortress
1,200km/h
Length 48.5m, Span 56.4m
16,000km
Capable of carrying twenty AGM-86 cruise missiles
93 (Nuclear mission: 44)

:
:
:
:
:
:

B-2A Spirit
1,010km/h
Length 21m, Span 52m (stealth aircraft)
11,100km
Carrying 16 strategic nuclear bombs
20 (Nuclear mission: 16)g)Strategic bomber
Type & Designation
Max. speed
Specifications
Range
PayloadNo. of submarines in serviceh)Strategic bomber
Type & Designation
Max. speed
specifications
Range
PayloadNo. of submarines in service©RECNA Nuclear Warhead Data Monitoring Team8 / 8