The Biden Administration’s Nuclear Posture Review

On 27 October 2022, the Biden administration finally released an unclassified version of its long-delayed Nuclear Posture Review (NPR). The classified NPR was released to Congress in March 2022, but its publication was substantially delayed––likely due to Russia’s invasion of Ukraine.

The Nuclear Posture Review (NPR) is the Pentagon’s primary statement of nuclear policy, produced by the last four presidents during their first years in office.

The NPR outlines the perceived global security environment, offers an overview of US nuclear capabilities, and considers plans for tailored deterrence, assurance, and arms control with allies and adversaries. The NPR can also be used to make changes to US declaratory nuclear policy, to consider alterations to the US nuclear stockpile, or to announce the introduction or retirement of specific weapon systems.

For more analysis, see: The 2022 Nuclear Posture Review: Arms Control Subdued by Military Rivalry

All of the nuclear-armed states––including the United States––plan to retain significant nuclear arsenals for the indefinite future.

All nine countries are modernizing their nuclear forces, several are adding new types, and many are increasing the role that nuclear weapons serve in military strategy and public statements.

For an overview of global modernization programs, see our annual contribution to the SIPRI Yearbook and our Status of World Nuclear Forces webpage. Individual country profiles are available in various editions the FAS Nuclear Notebook, which is published by the Bulletin of Atomic Scientists and is freely available to the public.

A brief analysis of the 2022 NPR is available below; a more robust and detailed analysis is available on the FAS Strategic Security Blog.

Major Components of the NPR

Assumptions About U.S. Competitors

The NPR suggests that “[b]y the 2030s the United States will, for the first time in its history, face two major nuclear powers as strategic competitors and potential adversaries.” This echoes previous statements from high-ranking US military leaders, including the former and incoming Commanders of US Strategic Command. 

China

Given that the National Defense Strategy is largely focused on China, it is unsurprising that the NPR declares China to be “the overall pacing challenge for U.S. defense planning and a growing factor in evaluating our nuclear deterrent.” 

Echoing the findings of the previous year’s China Military Power Report, the NPR suggests that “[t]he PRC likely intends to possess at least 1,000 deliverable warheads by the end of the decade.” According to the NPR, China’s more diverse nuclear arsenal “could provide the PRC with new options before and during a crisis or conflict to leverage nuclear weapons for coercive purposes, including military provocations against U.S. Allies and partners in the region.”

Russia

The NPR presents harsh language about Russia, in particular surrounding its behavior around the invasion of Ukraine. In contrast to the Trump administration’s NPR, the assumptions surrounding a potential low-yield escalate-to-deescalate policy are no longer present; instead the NPR simply states that Russia is diversifying its arsenal and that it views its nuclear weapons as “a shield behind which to wage unjustified aggression against [its] neighbors.” The NPR also suggests that “Russia is pursuing several novel nuclear-capable systems designed to hold the U.S. homeland or Allies and partners at risk, some of which are also not accountable under New START.”

Nuclear Declaratory Policy

The NPR reaffirms long-standing policy about the role of U.S. nuclear weapons but with slightly modified language. This includes: 1) Deter strategic attacks, 2) Assure allies and partners, and 3) Achieve U.S. objectives if deterrence fails. 

The NPR reiterates the language from the 2010 NPR that the “fundamental role” of U.S. nuclear weapons “is to deter nuclear attacks” and only in “extreme circumstances.” The strategy seeks to “maintain a very high bar for nuclear employment” and, if employment of nuclear weapons is necessary, “seek to end conflict at the lowest level of damage possible on the best achievable terms for the United States and its Allies and partners.”

During his presidential campaign, Joe Biden spoke repeatedly in favor of a no-first-use and sole-purpose policy for U.S. nuclear weapons. But the NPR explicitly rejects both under current conditions.

Interestingly, the NPR states that “hedging against an uncertain future” is no longer a stated (formal) role of nuclear weapons. Hedging has been part of a strategy to be able to react to changes in the threat environment, for example by deploying more weapons or modifying capabilities. The change does not mean that the United States is no longer hedging, but that hedging is part of managing the arsenal, rather than acting as a role for nuclear weapons within U.S. military strategy writ large.

Nuclear Modernization

The NPR reaffirms a commitment to the modernization of its nuclear forces, nuclear command and control and communication systems (NC3), and production and support infrastructure. This is essentially the same nuclear modernization program that has been supported by the past three administrations.

But there are some differences. The NPR also identifies “current and planned nuclear capabilities that are no longer required to meet our deterrence needs.” This includes retiring the B83-1 megaton gravity bomb and cancelling the nuclear sea-launched cruise missile (SLCM-N). These decisions were expected and survived opposition from defense hawks and nuclear lobbyists.

The review also notes that “[t]he United States will work with Allies concerned to ensure that the transition to modern DCA and the B61-12 bomb is executed efficiently and with minimal disruption to readiness.”

Nuclear-Conventional Integration

Although the integration of nuclear and conventional capabilities into strategic deterrence planning has been underway for years, the NPR seeks to deepen it further. It “underscores the linkage between the conventional and nuclear elements of collective deterrence and defense” and adopts “an integrated deterrence approach that works to leverage nuclear and non-nuclear capabilities to tailor deterrence under specific circumstances.”

This is not only intended to make deterrence more flexible and less nuclear focused when possible, but it also continues the strategy outlined in the 2010 NPR and 2013 Nuclear Employment Guidance to reduce reliance on nuclear weapons by relying more on new conventional capabilities.

Beyond force structure issues, this effort also appears to be a way to “raise the nuclear threshold” by reducing reliance on nuclear weapons but still endure in regional scenarios where an adversary escalates to limited nuclear use. In contrast, the 2018 NPR sought low-yield non-strategic “nuclear supplements” for such a scenario, and specifically named a Russian so-called “escalate-to-deescalate” scenario as a potentially possibility for nuclear use.

A significant challenge of deeper nuclear-conventional integration in strategic deterrence is to ensure that it doesn’t blur the line between nuclear and conventional war and inadvertently increase nuclear signaling during conventional operations.

Arms Control and Non-Proliferation

The Biden administration’s review contains significantly more positive language on arms control than can be found in the Trump administration’s NPR. The NPR concludes that “mutual, verifiable nuclear arms control offers the most  effective, durable and responsible path to achieving a key goal: reducing the role of nuclear weapons in U.S. strategy.”

In that vein, the review states a willingness to “expeditiously negotiate a new arms control framework to replace New START,” as well as an expansive recommitment to the Non-Proliferation Treaty (NPT), the Comprehensive Test-Ban Treaty (CTBT), and the Fissile Material Cutoff Treaty (FMCT). However, the authors take a negative view of the Treaty on the Prohibition of Nuclear Weapons (TPNW), stating that the United States does not “consider the TPNW to be an effective tool to resolve the underlying security conflicts that lead states to retain or seek nuclear weapons.”

Resources on Previous NPRs
Trump NPR (2018)

The Trump NPR perceived a rapidly deteriorating threat environment in which potential nuclear-armed adversaries are increasing their reliance on nuclear weapons and follows suit. The review reverses decades of bipartisan policy and orders what would be the first new nuclear weapons since the end of the Cold War. Furthermore, the document expands the use of circumstances in which the United States would consider employing nuclear weapons to include “non-nuclear strategic attacks.”


Obama NPR (2010)

The third Nuclear Posture Review set out from the start to produce a comprehensive public document. In this way, the review served several purposes: it provided an opportunity to interpret President Obama’s Prague commitment to seek the peace and security of a world without nuclear weapons, to explain the strategic benefits of the New START treaty and to establish the force structure to comply with it, and served as a prominent and public way of communicating with allies and adversaries. The central compact was that as long as nuclear weapons exist, the United States will maintain a safe, secure, and effective deterrent. In this way, the NPR could endorse modernization and sustainment investments while reducing the role and number of nuclear weapons. Though relatively modest in terms of force structure changes, the document’s main innovation was to declare that the United States will not use or threaten to use nuclear weapons against nonnuclear weapons states that are party to and remain in compliance with their obligations under the Nonproliferation Treaty.


Bush NPR (2002)

The second NPR was marked by inventive concepts and poor public relations. The intention was to produce a classified document that would be briefed publicly. In open testimony, Undersecretary of Defense for Policy Doug Feith described the NPR as an attempt rethink deterrence for a world where Russia was no longer an enemy. The nation’s strategic posture would no longer depend on Mutual Assured Destruction, but one Feith said would have “the flexibility to tailor military capabilities to a wide spectrum of contingencies.” Operational concepts would rely more on prompt conventional strike and defensive capabilities. To enhance flexibility, the NPR seemed to endorse development of new earth-penetrating warheads and also required a responsive infrastructure that could quickly produce and test new capabilities if a threat arose. Moving away from MAD allowed for a reduction of deployed warheads below 2,200, but the NPR mandated no further modifications to force structure. Three months after the initial briefing, selections of the classified report leaked to the media and were widely criticized by arms control groups and foreign officials. Fairly or unfairly, many read the leaked sections as blurring the line between nuclear and conventional weapons and refusing to accept mutual vulnerability. Administration officials scrambled to clarify but never fully dispelled concerns, leaving more questions than answers.


Clinton NPR (1994)

President Clinton ordered the first NPR to examine the role of nuclear weapons after the end of the Cold War. A five-person steering group led six working groups. The established process broke down in the summer of 1994 over tensions the steering group and the military stakeholders. In the end, the review failed to generate a unitary document; its results were briefed to the press and to Congress. The 1994 NPR established a force structure to comply with the START II Treaty and ordered cuts to each leg of the triad: conversion of four Ohio-class submarines and all B-1 bombers to conventional missions, reduction in B-52 and Minuteman III inventories, and elimination of Minuteman II and Peacekeeper ICBMs. Secretary of Defense Bill Perry summarized the NPR as an attempt to provide leadership for further reductions while hedging against the emergence of threats.


FAS Expert Analysis

Adam Mount, “The Biden Nuclear Posture Review: Obstacles to Reducing Reliance on Nuclear Weapons,” Arms Control Today, January/February 2022

Hans Kristensen and Matt Korda, “After Trump Secrecy, Biden Administration Restores US Nuclear Weapons Transparency,” FAS Strategic Security Blog, 6 October 2021

Commission on PPBE Reform’s Congressional Language

S. 1605 — National Defense Authorization Act for Fiscal Year 2022

​SEC. 1004. Commission on Planning, Programming, Budgeting, and Execution Reform.

            (a) Establishment.–

                         (1) In general.–There is hereby established an independent commission in the legislative branch to be known as the “Commission on Planning, Programming, Budgeting, and Execution Reform” (in this section referred to as the “Commission”).

                        (2) Date of establishment.–The Commission shall be established not later 30 days after the date of the enactment of this Act.

            (b) Membership.–

                        (1) Number and appointment.–The Commission shall be composed of 14 civilian individuals not employed by the Federal Government who are recognized experts and have relevant professional experience one or more of the following:

                                    (A) Matters relating to the planning, programming, budgeting, and execution process of the Department of Defense.

                                    (B) Innovative budgeting and resource allocation methods of the private sector.

                                    (C) Iterative design and acquisition process.

                                    (D) Budget or program execution data analysis.

                        (2) Members.–The members shall be appointed as follows:

                                    (A) The Secretary of Defense shall appoint two members.

                                    (B) The Majority Leader and the Minority Leader of the Senate shall each appoint one member.

                                    (C) The Speaker of the House of Representatives and the Minority Leader shall each appoint one member.

                                    (D) The Chair and the Ranking Member of the Committee on Armed Services of the Senate shall each appoint one member.

                                    (E) The Chair and the Ranking Member of the Committee on Armed Services of the House of Representatives shall each appoint one member.

                                    (F) The Chair and the Ranking Member of the Committee on Appropriations of the Senate shall each appoint one member.

                                    (G) The Chair and the Ranking Member of the Committee on Appropriations of the House of Representatives shall each appoint one member.

                        (3) Deadline for appointment.–Not later than 30 days after the date described in subsection (a)(2), members shall be appointed to the Commission.

                        (4) Expiration of appointment authority.–The authority to make appointments under this subsection shall expire on the date described in subsection (a)(2), and the number of members of the Commission shall be reduced by the number equal to the number of appointments so not made.

            (c) Chair and Vice Chair.–The Commission shall elect a Chair and Vice Chair from among its members.

            (d) Period of Appointment and Vacancies.–Members shall be appointed for the term of the Commission. A vacancy in the Commission shall not affect its powers and shall be filled in the same manner as the original appointment was made.

            (e) Purpose.–The purpose of the Commission is to–

                        (1) examine the effectiveness of the planning, programming, budgeting, and execution process and adjacent practices of the Department of Defense, particularly with respect to facilitating defense modernization;

                        (2) consider potential alternatives to such process and practices to maximize the ability of the Department of Defense to respond in a timely manner to current and future threats; and

                        (3) make legislative and policy recommendations to improve such process and practices in order to field the operational capabilities necessary to outpace near-peer competitors, provide data and analytical insight, and support an integrated budget that is aligned with strategic defense objectives.

            (f) Scope and Duties.–The Commission shall perform the following duties:

                        (1) Compare the planning, programming, budgeting, and execution process of the Department of Defense, including the development and production of documents including the Defense Planning Guidance (described in section 113(g) of title 10, United States Code), the Program Objective Memorandum, and the Budget Estimate Submission, with similar processes of private industry, other Federal agencies, and other countries.

                        (2) Conduct a comprehensive assessment of the efficacy and efficiency of all phases and aspects of the planning, programming, budgeting, and execution process, which shall include an assessment of–

                                    (A) the roles of Department officials and the timelines to complete each such phase or aspect;

                                    (B) the structure of the budget of Department of Defense, including the effectiveness of categorizing the budget by program, appropriations account, major force program, budget activity, and line item, and whether this structure supports modern warfighting requirements for speed, agility, iterative development, testing, and fielding;

                                    (C) a review of how the process supports joint efforts, capability and platform lifecycles, and transitioning technologies to production;

                                    (D) the timelines, mechanisms, and systems for presenting and justifying the budget of Department of Defense, monitoring program execution and Department of Defense budget execution, and developing requirements and performance metrics;

                                    (E) a review of the financial management systems of the Department of Defense, including policies, procedures, past and planned investments, and recommendations related to replacing, modifying, and improving such systems to ensure that such systems and related processes of the Department result in–

                                                (i) effective internal controls;

                                                (ii) the ability to achieve auditable financial statements; and

                                                (iii) the ability to meet other financial management and operational needs; and

                                    (F) a review of budgeting methodologies and strategies of near-peer competitors to understand if and how such competitors can address current and future threats more or less successfully than the United States.

                        (3) Develop and propose recommendations to improve the effectiveness of the planning, programming, budgeting, and execution process.

            (g) Commission Report and Recommendations.–

                        (1) Interim report.–Not later than February 6, 2023, the Commission shall submit to the Secretary of Defense and the congressional defense committees an interim report including the following:

                                    (A) An examination of the development of the documents described in subsection (f)(1).

                                    (B) An analysis of the timelines involved in developing an annual budget request and the future-years defense program (as described in section 221 of title 10, United States Code), including the ability to make changes to such request or such program within those timelines.

                                    (C) A review of the sufficiency of the civilian personnel workforce in the Office of the Secretary of Defense and the Office of Cost Assessment and Program Evaluation to conduct budgetary and program evaluation analysis.

                                    (D) An examination of efforts by the Department of Defense to develop new and agile programming and budgeting to enable the United States to more effectively counter near-peer competitors.

                                    (E) A review of the frequency and sufficiency of budget and program execution analysis, to include any existing data analytics tools and any suggested improvements.

                                    (F) Recommendations for internal reform to the Department relating to the planning, programming, budgeting, and execution process for the Department of Defense to make internally.

                                    (G) Recommendations for reform to the planning, programming, budgeting, and execution process that require statutory changes.

                                    (H) Any other matters the Commission considers appropriate.

                        (2) Final report.–Not later than September 1, 2023, the Commission shall submit to the Secretary of Defense and the congressional defense committees a final report that includes the elements required under paragraph (1).

                        (3) Briefings.–Not later than 180 days after the date specified in subsection (a)(2), and not later than 30 days after each of the interim and final reports are submitted, the Commission shall provide to the congressional defense committees a briefing on the status of the review and assessment conducted under subsection (f) and include a discussion of any interim or final recommendations.

                        (4) Form.–The reports submitted to Congress under paragraphs (1) and (2) shall be submitted in unclassified form but may include a classified annex.

            (h) Government Cooperation.–

                        (1) Cooperation.–In carrying out its duties, the Commission shall receive the full and timely cooperation of the Secretary of Defense in providing the Commission with analysis, briefings, and other information necessary for the fulfillment of its responsibilities.

                        (2) Liaison.–The Secretary shall designate at least one officer or employee of the Department of Defense to serve as a liaison between the Department and the Commission.

                        (3) Detailees authorized.–The Secretary may provide, and the Commission may accept and employ, personnel detailed from the Department of Defense, without reimbursement.

                        (4) Facilitation.–

                                    (A) Independent, non-government institute.–Not later than 45 days after the date specified in subsection (a)(2), the Secretary of Defense shall make available to the Commission the services of an independent, nongovernmental organization, described under section 501(c)(3) of the Internal Revenue Code of 1986 and which is exempt from taxation under section 501(a) of such Code, which has recognized credentials and expertise in national security and military affairs, in order to facilitate the discharge of the duties of the Commission under this section.

                                    (B) Federally funded research and development center.–On request of the Commission, the Secretary of Defense shall make available the services of a federally funded research and development center in order to enhance the discharge of the duties of the Commission under this section.

            (i) Staff.–

                        (1) Status as federal employees.–Notwithstanding the requirements of section 2105 of title 5, United States Code, including the required supervision under subsection (a)(3) of such section, the members of the commission shall be deemed to be Federal employees.

                        (2) Executive director.–The Commission shall appoint and fix the rate of basic pay for an Executive Director in accordance with section 3161(d) of title 5, United States Code.

                        (3) Pay.–The Executive Director, with the approval of the Commission, may appoint and fix the rate of basic pay for additional personnel as staff of the Commission in accordance with section 3161(d) of title 5, United States Code.

            (j) Personal Services.–

                        (1) Authority to procure.–The Commission may–

                                    (A) procure the services of experts or consultants (or of organizations of experts or consultants) in accordance with the provisions of section 3109 of title 5, United States Code; and

                                    (B) pay in connection with such services the travel expenses of experts or consultants, including transportation and per diem in lieu of subsistence, while such experts or consultants are traveling from their homes or places of business to duty stations.

                        (2) Maximum daily pay rates.–The daily rate paid an expert or consultant procured pursuant to paragraph (1) may not exceed the daily rate paid a person occupying a position at level IV of the Executive Schedule under section 5315 of title 5, United States Code.

            (k) Authority to Accept Gifts.–The Commission may accept, use, and dispose of gifts or donations of services, goods, and property from non-Federal entities for the purposes of aiding and facilitating the work of the Commission. The authority in this subsection does not extend to gifts of money. Gifts accepted under this authority shall be documented, and conflicts of interest or the appearance of conflicts of interest shall be avoided. Subject to the authority in this section, commissioners shall otherwise comply with rules set forth by the Select Committee on Ethics of the Senate and the Committee on Ethics of the House of Representatives governing Senate and House employees.

            (l) Legislative Advisory Committee.–The Commission shall operate as a legislative advisory committee and shall not be subject to the provisions of the Federal Advisory Committee Act (Public Law 92-463; 5 U.S.C. App) or section 552b, United States Code (commonly known as the Government in the Sunshine Act).

            (m) Contracting Authority.–The Commission may acquire administrative supplies and equipment for Commission use to the extent funds are available.

            (n) Use of Government Information.–The Commission may secure directly from any department or agency of the Federal Government such information as the Commission considers necessary to carry out its duties. Upon such request of the chair of the Commission, the head of such department or agency shall furnish such information to the Commission.

            (o) Postal Services.–The Commission may use the United States mail in the same manner and under the same conditions as departments and agencies of the United States.

            (p) Space for Use of Commission.–Not later than 30 days after the establishment date of the Commission, the Administrator of General Services, in consultation with the Commission, shall identify and make available suitable excess space within the Federal space inventory to house the operations of the Commission. If the Administrator is not able to make such suitable excess space available within such 30-day period, the Commission may lease space to the extent the funds are available.

            (q) Removal of Members.–A member may be removed from the Commission for cause by the individual serving in the position responsible for the original appointment of such member under subsection (b)(1), provided that notice has first been provided to such member of the cause for removal and voted and agreed upon by three quarters of the members serving. A vacancy created by the removal of a member under this subsection shall not affect the powers of the Commission, and shall be filled in the same manner as the original appointment was made.

            (r) Termination.–The Commission shall terminate 180 days after the date on which it submits the final report required by subsection (g)(2).

Resource Allocation Questions To Be Answered

The Day One Project recently conducted a white-boarding session with 20 PPBE experts. The product of this seminar is the following list of broad questions about the financial barriers to the Department of Defense’s efforts to modernize the US military. These questions, and the research necessary to answer them, can serve as a roadmap for the Commission on Planning, Programming, Budgeting, and Execution (PPBE) Reform’s work.

  1. Do PPBE and related resource allocation processes, including the appropriations process, limit the ability of emerging technologies to cross the “valley of death” into operations and contribute to DoD’s inability to compete in time with agile competitors?
  2. Is the DoD’s current planning process able to translate future concepts of operations into the programming guidance necessary to develop future warfighting capabilities, or is it overly constrained by the construct of a weapons system program?
  3. Does the current emphasis on a predictive requirements system hinder the Department’s ability to rapidly adopt emerging technologies and undermine its use of recent procurement reforms?
  4. Is the Department’s reliance on manual data calls, PowerPoint presentations, and PDF spreadsheets hosted on different enterprise systems a hindrance to effective budgetary oversight and digital transparency?
  5. Are year-of-execution reprogramming authorities big enough or flexible enough to allow the Department to take advantage of the dynamics of the emerging technology market?
  6. Are DoD’s programmatic measures of effectiveness and performance structured to value adherence to original predictions over the potential of unforeseen outcomes? Is the DoD measuring the right things?

Industrial Policy Memo

This summer, National Economic Council Director Brian Deese articulated a new vision for a robust and equitable U.S. industrial policy. The strategy seeks to help us reach the full potential of American competitiveness while delivering justice, equity, and prosperity to all citizens.

To inform the Administration’s new strategy, we pulled together a curated set of ideas from our extensive portfolio of nonpartisan, actionable ideas in science and technology policy. These ideas were diversely sourced from more than 300 Day One contributors — including students, academics, activists, industry leaders, local and international government officials, and more.​

Our letter addresses each of the industrial strategy’s core pillars:

Pillar I: Supply-Chain Resilience
Pillar II: Targeted Public Investment
Pillar III: Public Procurement
Pillar IV: Climate Resilience
Pillar V: Equity

​We hope that these ideas help advance the vision of a modern industrial policy that benefits all Americans.

Read the full memo at Day One Project

What Is the Sole Purpose of U.S. Nuclear Weapons?

Read the full report PDF here. 

Summary

Depending on how it is defined, sole purpose could have transformational effects on nearly every aspect of nuclear weapons policy or relatively modest effects. It could accommodate or incorporate a range of related policy options, like a deterrence-only posture or no first use.

In January 2021, President Biden assumed office after having made unusually explicit commitments to reduce the role of nuclear weapons in US national security strategy. In his primary articulation of his campaign’s foreign policy, Biden declared that “the sole purpose of the US nuclear arsenal should be deterring—and if necessary, retaliating against—a nuclear attack.”1 Since assuming office, Biden has not repeated the pledge, though his initial national security guidance and his Secretary of State have reiterated the goal of reducing reliance on nuclear weapons.2 As the Pentagon begins its review of nuclear weapons policy, Biden and his national security officials will have to determine whether to adopt sole purpose and, if so, what it means. The established language on sole purpose offers the administration considerable latitude in how it chooses to reduce reliance on nuclear weapons. Depending on how sole purpose is defined and implemented, it could have transformative consequences for nuclear force structure and strategy, or it could end up as a rhetorical commitment that has few practical effects at all.

Though the language dates back decades, there has never been a precise or agreed definition of sole purpose. The first published use of the phrase is in a piece Albert Einstein related to the eminent journalist Raymond Swing that was published in the Atlantic in 1947. Einstein argued while the United States must stockpile the bomb, it should forswear its use. “Deterrence should be the only purpose of the stockpile of bombs.” If the United Nations were granted international control over atomic energy, as President Truman had proposed, it should be “for the sole purpose of deterring an aggressor or rebellious nations from making an atomic attack.”3 Since the idea was popularized in the 1960s, sole purpose has become a persistent staple in ongoing debates about the role of nuclear weapons, but it has rarely been attached to a precise definition or a plan to implement it.

Sole purpose is more ambiguous than other declaratory policy proposals (such as no first use) because it purports to define, or constrain, the purpose of nuclear weapons. Depending on how the terms of the statement are defined and how the statement is implemented in practice, its effects could be broad, narrow, restrictive, permissive, or ambiguous. For example, President Biden’s sole purpose language could be construed to proscribe nuclear weapons from performing a wide range of functions or from being used in wide ranges of contingencies. Slight variations in the wording of a sole purpose declaration can produce dramatically different policies and be perceived differently by allies and adversaries, who will examine the policy closely. Depending on how sole purpose is defined and implemented, sole could reduce or eliminate requirements for each piece of the triad or for nuclear use in a variety of different contingency plans.

Sole purpose is one potential option in declaratory policy, that aspect of nuclear weapons policy that publicly communicates when and why the United States would consider the use of nuclear weapons. It can be combined with or can subsume a range of other potential declaratory policy options. Because the president has sole authority to order the use of a nuclear weapon, only the president can set limits on that power. Though changes in declaratory policy should consider the views of civilian national security officials, uniformed military officials, members of Congress, US allies, and the American public, the president should provide clear guidance on how to modify US declaratory policy. Like all presidents, President Biden should provide clear guidance to the officials conducting the national defense strategy about nuclear declaratory policy.

Because sole purpose could potentially be defined in many different ways, some definitions will be better or worse. Advocates or opponents should be clear about what constitutes a better or worse definition. The administration should not accept the argument that a good definition is one that preserves existing force structure or plans, maintains ambiguity for its own sake, or comports with the preferences of certain allies or services. This piece argues that a good definition of sole purpose is one that assists with the development and implementation of a credible, integrated posture by which the United States and its allies deter aggression and nuclear use; reflects the president’s preferences about how to manage escalation in limited conflicts with nuclear-armed adversaries as well as his assessment of the requirements of deterring a major strategic attack; reduces the risk of misperception and adversary nuclear first use incentives; and can be implemented in force structure and plans so that it is resilient to leadership changes in the United States. Because the president has expressed a preference to reduce the nation’s reliance on nuclear weapons, a good definition of sole purpose should help to do so in ways consistent with his preferences.

This piece examines the range of options available to officials working to define sole purpose and reduce reliance on nuclear weapons. It explores the practical implications of different definitions of sole purpose and the steps necessary to ensure that they are implemented in a way that is responsible, effective, and most likely to endure over time. There are two central arguments. First, sole purpose should not be understood as a nuclear declaratory policy but as critical component in an integrated deterrence strategy. Understood in this way, sole purpose is not only a valuable means of reducing the risk of nuclear escalation and of meeting US commitments to reduce reliance on nuclear weapons but because it is a substantive judgment about how US nuclear and nonnuclear forces can best manage escalation in a limited conflict with a nuclear-armed adversary. Second, an effective sole purpose policy cannot simply be a sentence in a paragraph on nuclear declaratory policy. If the administration is serious about attaining the benefits of sole purpose, the policy should be comprised of the declaratory statement, additional language to clarify and contextualize the policy, and a set of directives that communicate the president’s guidance for how the policy should affect force structure and plans.

Each of these arguments is critical for attaining the benefits of sole purpose and for maintaining an effective deterrence posture. Sole purpose will be a contentious idea under any circumstances. Allied governments, advocates of various aspects of the current nuclear weapons policies, and political opponents are understandably concerned about the president’s statements. Clearly defining the policy, articulating how it will strengthen an integrated deterrence policy, and moving forward with implementation will help to convince allies and many deterrence experts that sole purpose will increase rather than decrease deterrence credibility.

What Is the Sole Purpose of U.S. Nuclear Weapons?

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Summary

Depending on how it is defined, sole purpose could have transformational effects on nearly every aspect of nuclear weapons policy or relatively modest effects. It could accommodate or incorporate a range of related policy options, like a deterrence-only posture or no first use.

In January 2021, President Biden assumed office after having made unusually explicit commitments to reduce the role of nuclear weapons in US national security strategy. In his primary articulation of his campaign’s foreign policy, BJoseph R. Biden, “Why American Must Lead Again: Rescuing US Foreign Policy after Trump,” Foreign Affairs 99 (2020): 64.iden declared that “the sole purpose of the US nuclear arsenal should be deterring—and if necessary, retaliating against—a nuclear attack.”1 Since assuming office, Biden has not repeated the pledge, though his initial national security guidance and his Secretary of State have reiterated the goal of reducing reliance on nuclear weapons.2 As the Pentagon begins its review of nuclear weapons policy, Biden and his national security officials will have to determine whether to adopt sole purpose and, if so, what it means. The established language on sole purpose offers the administration considerable latitude in how it chooses to reduce reliance on nuclear weapons. Depending on how sole purpose is defined and implemented, it could have transformative consequences for nuclear force structure and strategy, or it could end up as a rhetorical commitment that has few practical effects at all.

Though the language dates back decades, there has never been a precise or agreed definition of sole purpose. The first published use of the phrase is in a piece Albert Einstein related to the eminent journalist Raymond Swing that was published in the Atlantic in 1947. Einstein argued while the United States must stockpile the bomb, it should forswear its use. “Deterrence should be the only purpose of the stockpile of bombs.” If the United Nations were granted international control over atomic energy, as President Truman had proposed, it should be “for the sole purpose of deterring an aggressor or rebellious nations from making an atomic attack.3 Since the idea was popularized in the 1960s, sole purpose has become a persistent staple in ongoing debates about the role of nuclear weapons, but it has rarely been attached to a precise definition or a plan to implement it.

Sole purpose is more ambiguous than other declaratory policy proposals (such as no first use) because it purports to define, or constrain, the purpose of nuclear weapons. Depending on how the terms of the statement are defined and how the statement is implemented in practice, its effects could be broad, narrow, restrictive, permissive, or ambiguous. For example, President Biden’s sole purpose language could be construed to proscribe nuclear weapons from performing a wide range of functions or from being used in wide ranges of contingencies. Slight variations in the wording of a sole purpose declaration can produce dramatically different policies and be perceived differently by allies and adversaries, who will examine the policy closely. Depending on how sole purpose is defined and implemented, sole could reduce or eliminate requirements for each piece of the triad or for nuclear use in a variety of different contingency plans.

Sole purpose is one potential option in declaratory policy, that aspect of nuclear weapons policy that publicly communicates when and why the United States would consider the use of nuclear weapons. It can be combined with or can subsume a range of other potential declaratory policy options. Because the president has sole authority to order the use of a nuclear weapon, only the president can set limits on that power. Though changes in declaratory policy should consider the views of civilian national security officials, uniformed military officials, members of Congress, US allies, and the American public, the president should provide clear guidance on how to modify US declaratory policy. Like all presidents, President Biden should provide clear guidance to the officials conducting the national defense strategy about nuclear declaratory policy.

Because sole purpose could potentially be defined in many different ways, some definitions will be better or worse. Advocates or opponents should be clear about what constitutes a better or worse definition. The administration should not accept the argument that a good definition is one that preserves existing force structure or plans, maintains ambiguity for its own sake, or comports with the preferences of certain allies or services. This piece argues that a good definition of sole purpose is one that assists with the development and implementation of a credible, integrated posture by which the United States and its allies deter aggression and nuclear use; reflects the president’s preferences about how to manage escalation in limited conflicts with nuclear-armed adversaries as well as his assessment of the requirements of deterring a major strategic attack; reduces the risk of misperception and adversary nuclear first use incentives; and can be implemented in force structure and plans so that it is resilient to leadership changes in the United States. Because the president has expressed a preference to reduce the nation’s reliance on nuclear weapons, a good definition of sole purpose should help to do so in ways consistent with his preferences.

This piece examines the range of options available to officials working to define sole purpose and reduce reliance on nuclear weapons. It explores the practical implications of different definitions of sole purpose and the steps necessary to ensure that they are implemented in a way that is responsible, effective, and most likely to endure over time. There are two central arguments. First, sole purpose should not be understood as a nuclear declaratory policy but as critical component in an integrated deterrence strategy. Understood in this way, sole purpose is not only a valuable means of reducing the risk of nuclear escalation and of meeting US commitments to reduce reliance on nuclear weapons but because it is a substantive judgment about how US nuclear and nonnuclear forces can best manage escalation in a limited conflict with a nuclear-armed adversary. Second, an effective sole purpose policy cannot simply be a sentence in a paragraph on nuclear declaratory policy. If the administration is serious about attaining the benefits of sole purpose, the policy should be comprised of the declaratory statement, additional language to clarify and contextualize the policy, and a set of directives that communicate the president’s guidance for how the policy should affect force structure and plans.

Each of these arguments is critical for attaining the benefits of sole purpose and for maintaining an effective deterrence posture. Sole purpose will be a contentious idea under any circumstances. Allied governments, advocates of various aspects of the current nuclear weapons policies, and political opponents are understandably concerned about the president’s statements. Clearly defining the policy, articulating how it will strengthen an integrated deterrence policy, and moving forward with implementation will help to convince allies and many deterrence experts that sole purpose will increase rather than decrease deterrence credibility.

Unleashing international entrepreneurs to help the U.S. economy recover from the pandemic

In 2014, then-Secretary of the Department of Homeland Security (DHS) Jeh Johnson issued a memo (The 2014 memo) recommending “policies supporting U.S. high-skilled businesses and workers.” DHS offered a range of policies for updating the employment-based immigration system to encourage economic development. We propose that DHS issue a follow-up memo now focused specifically on international entrepreneurs to help the U.S. economy recover from the pandemic.

Read the full report at Brookings

Siloed Thinking: A Closer Look at the Ground-Based Strategic Deterrent

“Siloed Thinking,” authored by Research Associate Matt Korda, reviews the fundamental role of intercontinental ballistic missiles (ICBMs) in US nuclear strategy and examines the Pentagon’s justifications for pursuing an ICBM replacement program.

The report ultimately suggests that these justifications were based on flawed assumptions, and many have since been deprioritized. The report also suggests that the initial outcome favoring a brand-new ICBM replacement program was largely predetermined by arbitrary force requirements and timelines that have little 21st century strategic rationale.

These conclusions suggest that the Pentagon’s case for the ICBM replacement program, known as the Ground-Based Strategic Deterrent (GBSD) needs to be reevaluated in light of cost escalation and surrounding budgetary pressures.

Download the report here.

A More Responsible Digital Surveillance Future

At a time when democratic rule of law and human rights have weakened globally, emerging digital surveillance technologies have made the authoritarian model more accessible, stable, and competitive than ever before.

Read the report here.

Alternatives to the Ground-Based Strategic Deterrent

This policy memo suggests that the Biden administration should immediately launch a National Security Council-led strategic review examining the role of ICBMs in US nuclear strategy, and presents four alternative policy options that the Biden administration could pursue in lieu of the current GBSD program of record.

Download the report here.

Public Perspectives on the US Intercontinental Ballistic Missile Force

This report features the results of an October 2020 poll on US nuclear policy conducted by ReThink Media on behalf of the Federation of American Scientists.

Download the report here. View the polling as a webpage here.

An Integrated Approach to Deterrence Posture

The primary deterrence challenge facing the United States today is preventing aggression and escalation in limited conventional conflicts with a nuclear-armed adversary. It is a difficult conceptual and practical challenge for both conventional and nuclear strategy—but existing Pentagon strategy development processes are not equipped to integrate these tools to meet the challenge.

At the conceptual level, two strategy documents guide U.S. deterrence policy. The 2018 National Defense Strategy (NDS) described how multiple layers of conventional forces can help to deter aggression by nuclear-armed adversaries while the 2018 Nuclear Posture Review (NPR) proposed new nonstrategic nuclear options to enhance deterrence of aggression and nuclear use. The two documents each present a strategy for deterring nuclear-armed adversaries in regional conflicts and serve as valuable public diplomacy tools to explain U.S. strategic thinking and intentions to allies and partners, potential adversaries, the public, and Congress.

However, it is not clear how the strategies described in the NDS and the NPR relate to each other. What is the respective role of nuclear and conventional weapons in managing escalation in a limited conflict? How can conventional weapons deter and respond to an adversary’s limited nuclear employment? As nuclear forces consume an increasing proportion of Pentagon procurement budgets, how should the services balance competing nuclear and conventional priorities? While these questions of national policy go unanswered, commands are also struggling with a number of practical challenges with operating conventional forces under the shadow of nuclear escalation. Are combatant commands prepared to conduct nuclear signaling and employment operations during a limited conventional conflict, given complex logistical and strategic challenges? How can conventional forces operate effectively in an environment that may be degraded by nuclear use?

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