About NNSA
Established by Congress in 2000, NNSA is a semi-autonomous agency within the U.S. Department of Energy that protects our nation by designing and delivering a safe, secure, reliable, and effective U.S. nuclear stockpile; forging solutions that enable global security and stability through nonproliferation, counterproliferation, and emergency response; providing nuclear propulsion to power a global U.S. Navy; and leveraging transformative technologies to address emerging challenges.
Our Partners
NNSA and our partners across laboratories, plants, and sites — collectively the Nuclear Security Enterprise — provide comprehensive nuclear security solutions that protect the American people, our allies, and our partners in a dynamic world.
Highlights
The U.S. Nuclear Weapons Stockpile
One of NNSA’s core missions is to ensure the United States maintains a safe, secure, and reliable nuclear stockpile through the application of unparalleled science, technology, engineering, and manufacturing. The Office of Defense Programs carries out NNSA’s mission to maintain and modernize the nuclear stockpile.
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September 8, 2026
