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Office of the Assistant Secretary of War for Nuclear Deterrence, Chemical, and Biological Defense, Policy and Programs

nd-cbd seal

The Office of the Assistant Secretary of War for Nuclear Deterrence, Chemical, and Biological Defense Policy and Programs (OASW(ND-CBD)) leads DoW efforts to ensure a safe, secure, and effective U.S. nuclear deterrent against weapons of mass destruction threats. As the world returns to Great Power competition and the recognition that threats against the United States, its allies and interests are both proliferating and becoming more difficult to challenge, the OASW(ND-CBD) is at the forefront of U.S. efforts to sustain and modernize the nuclear deterrent, while simultaneously providing chemical and biological defense and compliance with international NCB treaties and agreements. In addition, OASW(ND-CBD) is responsible for interagency coordination and international engagement on CWMD policy and strategy. From the operational, to the administrative, to the speed of response and production, the OASW(ND-CBD) is reshaping the way the DoW meets and responds to WMD threats..

Our Mission

Lead Department of War policy, programs, and activities for nuclear deterrence and to counter, reduce, and defend against nuclear, chemical, biological, radiological, and related threats to safeguard the Nation and protect our warfighters.

Strategic Goals

Secure, sustain, and maintain the U.S. nuclear deterrent and recapitalize the nuclear enterprise.

Enable Joint Force freedom of maneuver in chemical, biological, radiological, and nuclear (CBRN) environments.

Develop capabilities to counter CBRN threats and respond to and manage the consequences of WMD effects.

Support and enable allies and partners to enhance deterrence and counter WMD proliferation while complying with relevant international treaties and agreements.

Streamline policies, procedures, and guidelines to promote efficiency, effectiveness, transparency and coordinate intra- and interagency efforts.

OASW(ND-CBD) LEADERSHIP

Honorable Robert Kadlec

Honorable

Honorable Robert Kadlec

Assistant Secretary of War for Nuclear Deterrence, Chemical, and Biological Defense, Policy and Programs (ASW(ND-CBD))

 

Photo Biography
Dr. Robert Soofer

Dr. Robert Soofer

Acting Principal Deputy Assistant Secretary of War for Nuclear Deterrence, Chemical, and Biological Defense, Policy and Programs (PD ASW(ND-CBD))

 

Photo Biography
Mr. Drew Walter

Mr. Drew Walter

Deputy Assistant Secretary of War for Nuclear Matters (DASW(NM))

Ian Watson

Mr. Ian Watson

Deputy Assistant Secretary of War for CBRN Defense (DASW(CBRND))

Dr. Robert Soofer

Dr. Robert Soofer

DASW for Nuclear Deterrence and CWMD Policy

Major General Lyle K. Drew

Major General Lyle K. Drew

Acting Director, Defense Threat Reduction Agency (DTRA)

ORGANIZATION

ND-CBD Organization Chart

ND-CBD ENTERPRISE

Nuclear Deterrent

NUCLEAR DETERRENT

Ensure the safety, security and effectiveness of the U.S. nuclear deterrent.

Countering WMD

COUNTERING WMD

Prevent the spread of, protect against, and respond to weapons of mass destruction threats.

Countering Improvised Threats

EMERGING THREATS

Providing expertise to detect, deter, and defeat WMD and emerging threats.

Treaties and Agreements

TREATIES AND AGREEMENTS

Ensure DoW compliance with nuclear, chemical and biological treaties and agreements.


ND-CBD COMPONENT OFFICES

NUCLEAR MATTERS

Nuclear Matters serves as the focal point for DoW activities and initiatives related to the dual missions of sustaining a safe, secure, and effective nuclear deterrent and countering the threat from nuclear terrorism and nuclear proliferation. In this capacity, the ODASW(NM) also serves as a primary point of contact for Congress, the interagency, and the public. The ODASW(NM) also provides staff support to the Nuclear Weapons Council and the Security and Incidence Response Council as well as their subordinate committees. The office is comprised of representatives from all areas of the nuclear community, to include the U.S. Navy, the U.S. Air Force, the Department of Energy via the National Nuclear Security Agency, Los Alamos National Laboratory, Lawrence Livermore National Laboratory, Sandia National Laboratories, the Kansas City National Security Campus, and the Federal Bureau of Investigation.

Visit the Nuclear Matters website.


CBRN Defense

The Deputy Assistant Secretary of War for CBRN Defense (DASW(CBRND)), on behalf of ASD(ND-CBD), oversees the Chemical and Biological Defense Program (CBDP), which develops chemical and biological defense capabilities for the entire Joint Force. DASW(CBRND) provides the CBDP’s strategic guidance, manages the planning, programming, budgeting, and execution process, and oversees research, development, and acquisition activities. Additional responsibilities include leading the CBDP’s interagency and international cooperation and ensuring consistent and effective strategic messaging with key stakeholders. DASW(CBRND) also serves as the principal advisor to ASD(ND-CBD) on chemical and biological defense issues.

Visit the CBRN Defense website.


CWMD Policy

The mission of the Deputy Assistant Secretary of War for Nuclear and Countering Weapons of Mass Destruction (CWMD) Policy is to support the Under Secretary of War for Policy and Assistant Secretary of War for Space Policy by developing strategies, informing policies, and conducting oversight of nuclear deterrence policy and arms control, as well as developing and overseeing the implementation of strategies and policies of all Countering Weapons of Mass Destruction policy issues, to include preventing the proliferation of WMD-related materials; the DOW Cooperative Threat Reduction (CTR) Program; and Chemical, Biological, Radiological and Nuclear (CBRN) defense.

Visit the CWMD Policy website.


DEFENSE THREAT REDUCTION AGENCY (DTRA)

The Defense Threat Reduction Agency (DTRA) is the only Department of War organization focused exclusively on countering and deterring weapons of mass destruction (WMD) and emerging threats. Designated both a Defense Agency and Combat Support Agency, DTRA identifies, develops, and fields leading-edge solutions that provide the Military Services, Combatant Commands, U.S. Interagency, and foreign partners/allies unparalleled capabilities to detect, deter, and defeat WMD and emerging threats. DTRA's unique technical expertise across the chemical, biological, radiological, nuclear, and emerging threat space, enables nonproliferation, counterproliferation, interdiction, arms control, and risk-reduction missions worldwide. From the gray zone through great power competition, DTRA works with our mission partners to preserve peace and prepare for uncertainty by delivering innovative capabilities, objective analysis, and world-class subject matter expertise.

Visit the Defense Threat Reduction Agency website.


ND-CBD HISTORY

The Atomic Energy Act of 1946 established the civilian Atomic Energy Commission (AEC) to replace the Manhattan Project. The Atomic Energy Act of 1954 established the DoD Military Liaison Committee (MLC) to coordinate military requirements with the AEC. The MLC functioned as the authorized channel of communication between the Department of Defense (DoD) and the Department of Energy (DOE) or its predecessor agencies on all atomic energy matters relating to the military applications of atomic weapons or atomic energy. The committee addressed matters of policy, programming, and commitment of funds to the military application of atomic energy.

In 1951, the Secretary of Defense moved the MLC to the Pentagon and designated its chairman as the Deputy to the Secretary of Defense for Atomic Energy Matters. In 1953, this position was re-designated under DoD Directive 5130.2 as the Assistant to the Secretary of Defense for Atomic Energy (ATSD(AE)).

From 1982-1996, the role of the ATSD(AE) expanded to include issues associated with chemical and biological weapons, the implementation of arms control treaties and agreements, counterproliferation programs, and the coordination of the Cooperative Threat Reduction (CTR) Program, which assists in the elimination of weapons of mass destruction (WMD) in the former Soviet states. Additionally, in 1994, the Defense Nuclear Agency (DNA) was placed under the oversight of the ATSD(AE). DNA is now known as the Defense Threat Reduction Agency (DTRA).

As part of the 1996 Defense Authorization Act, the ATSD(AE) became the Assistant to the Secretary of Defense for Nuclear and Chemical and Biological Defense Programs (ATSD(NCB)), reflecting the expanded mission of the organization and more accurately describing its multiple functions.

Between 1997 and 2001, the Administration declined to nominate anyone to serve as the ATSD(NCB), having determined, as part of the Defense Reform Initiative, that the position should be eliminated. Congress, however, maintained that the position was necessary to ensure appropriate senior-level policy oversight and implementation guidance within the Department.

While the ATSD(NCB) position was vacant, the Under Secretary of Defense for Acquisition, Technology, and Logistics (USD(AT&L)) assumed the responsibilities of the ATSD(NCB). The USD(AT&L) delegated many of the ATSD(NCB) nuclear weapons-related duties to the Director of Defense Research and Engineering (DDR&E) until November 2001, when the ATSD(NCB) position was again filled.

In 2001, the ATSD(NCB) position was filled by the Senate-confirmed appointment of Dr. Dale Klein. The Honorable Dale Klein held the ATSD(NCB) position until June 30, 2006, when he left to become the Chairman of the Nuclear Regulatory Commission. From June 2006 until August 2008, Dr. Arthur T. Hopkins served as the acting ATSD(NCB). In August 2008, The Honorable Mr. Fred Celec was sworn in as the ATSD(NCB). On May 18, 2009, the Honorable Andrew C. Weber was confirmed as the ATSD(NCB).

In January 2011, Congress redesignated the ATSD position as the Assistant Secretary of Defense for Nuclear, Chemical, and Biological Defense Programs (ASD(NCB)).

In December 2024, Congress redesignated the ASD(NCB) position as the Assistant Secretary of Defense for Nuclear Deterrence, Chemical, and Biological Defense Policy and Programs (ASD(ND-CBD)) in the National Defense Authorization Act for FY 2025. The law designated this ASD as the principal civilian advisor responsible for the overall supervision of all nuclear deterrence policy, operations, and activities, as well as the oversight of all nuclear deterrence programs and portfolio management across the nuclear enterprise. In this capacity, the ASD(ND-CBD) also:

  • Serves as the Staff Director of the Nuclear Weapons Council;
  • Serves as the principal interface with the Department of Energy on issues related to nuclear fuels;
  • Advises on nuclear energy matters; and
  • Advises on all matters related to the defense against chemical, biological, and other weapons of mass destruction.

The Deputy Secretary of Defense formally established the Office of the ASD(ND-CBD) in the Department of Defense on May 21, 2025. On September 5, 2025, President Donald J. Trump authorized the use of "Department of War" as a secondary title for the DoD and its officials, thereby renaming the ASD(ND-CBD) to the Assistant Secretary of War for ND-CBD (ASW(ND-CBD)).

The ASW(ND-CBD) operates under a unique reporting structure in the Department as a direct report to two different Principal Staff Assistants—the Under Secretaries of War for Policy (USW(P)) and Acquisition and Sustainment (USW(A&S)). As such, the Office of the ASW(ND-CBD) is a component of the Offices of the USW(P) and USW(A&S) and has authority, direction, and control of offices across both Components, to include the:

  • Defense Thread Reduction Agency;
  • DASW for Nuclear Deterrence and Countering Weapons of Mass Destruciton Policy;
  • DASW for Nuclear Matters; and
  • DASW for Chemical, Biological, Radiological, and Nuclear Defense Programs (DASW(CBRND))

On December 29, 2025, the Honorable Robert P. Kadlec was sworn in as the ASW(ND-CBD).


RESOURCES

2024 CBDP Enterprise Strategy

CBDP Rapid Response System for Medical Countermeasure Development

DoWD 5134.08, Assistant Secretary of War for Nuclear, Chemical, and Biological Defense Programs (ASD(ND-CBD))

DoWD 5105.62, Defense Threat Reduction Agency (DTRA)


Title 50 US Code, Chapter 40, Defense Against Weapons of Mass Destruction

Title 50 US Code, Chapter 43, Preventing Weapons of Mass Destruction Proliferation and Terrorism

Title 10 US Code, section 179, Nuclear Weapons Council


2023 Biodefense Posture Review

2022 National Defense Strategy (including 2022 Nuclear Posture Review and 2022 Missile Defense Review)

2022 Nuclear Posture Review (NPR) Fact Sheet

2022 National Biodefense Strategy and Implementation Plan

2018 National Biodefense Strategy

2018 National Strategy for Countering Weapons of Mass Destruction Terrorism

2017 National Security Strategy

2014 Quadrennial Defense Review

National Strategy for Countering Biological Threats