Nuclear Security

National Nuclear Security Administration

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About the Nuclear Security Enterprise

The strategic environment has changed with the expanding capability of world actors. The future environment is less predictable and demands our national deterrence strategy accounts for the nature of this uncertainty.

NNSA's core missions include maintaining the nuclear stockpile, monitoring and promoting nonproliferation, powering the nuclear Navy, and responding to nuclear and radiological emergencies.

NNSA's Core Missions

President Donald J. Trump directed Defense Secretary Jim Mattis to initiate a new Nuclear Posture Review to ensure the nation's nuclear deterrent is modern, robust, flexible, resilient, ready and appropriately tailored to deter 21st century threats and reassures allies.

Two related NNSA reports are the Stockpile Stewardship and Management Plan (SSMP) and Prevent, Counter, and Respond—A Strategic Plan to Reduce Global Nuclear Threats (NPCR).

Faces of the Nuclear Security Enterprise


Nuclear Weapons Life Cycle fact sheet
A summary of the life cycle of U.S. nuclear weapons development.
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B61-12 Life Extension Program (LEP)
A fact sheet about the B61-12 Life Extension Program.
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W76-1 Life Extension Program (LEP)
A fact sheet about the W76-1 Life Extension Program.
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W80-4 Life Extension Program (LEP)
A fact sheet about the W80-4 Life Extension Program.
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W88 Alteration 370
A fact sheet about the W88 Alteration 370.
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The U.S. nuclear deterrent cannot exist without a resilient and effective nuclear weapons infrastructure.
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U.S. strategy to combat nuclear terrorism encompasses a wide range of activities that comprise a defense-in-depth against current and emerging dangers
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Nuclear Weapons
U.S. nuclear capabilities make essential contributions to the deterrence of nuclear and non-nuclear aggression.
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Nonproliferation and Arms Control
The United States will continue to pursue the political and security condition that could enable further nuclear reductions.
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NNSA leaders introduce Nuclear Posture Review to their team
On Feb. 27, 2018, NNSA leaders rolled out the 2018 Nuclear Posture Review to the agency's federal and contractor workforce.
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A deeper look at the Nuclear Security Enterprise

On Deterrence

On Deterrence

Naval Reactors

Powering the Nuclear Navy (U.S. Department of Energy)

Deputy Secretary Discusses NPR

Deputy Secretary of Energy Dan Brouillette discusses NNSA's role in the Nuclear Posture Review

Lawrence Livermore National Lab

LLNL Missions slideshow

Los Alamos National Lab

Our Mission

Sandia National Labs

Sandia Labs: Who We Are


The White House
The White House is home to the President and seat of the executive branch.
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State Department
The mission of the U.S. Department of State is to advance the national interests of the United States and its people.
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Department of Defense
The mission of the Department of Defense is to provide the military forces needed to deter war and to protect the security of our country.
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