About NNSA

Established by Congress in 2000, NNSA is a semi-autonomous agency within the U.S. Department of Energy responsible for enhancing national security through the military application of nuclear science. NNSA maintains and enhances the safety, security, and effectiveness of the U.S. nuclear weapons stockpile; works to reduce the global danger from weapons of mass destruction; provides the U.S. Navy with safe and militarily effective nuclear propulsion; and responds to nuclear and radiological emergencies in the United States and abroad.

You can view the NNSA at a Glance Fact Sheet for details on NNSA’s modern-day mission or take a deep dive into the broader historical context of the U.S. Nuclear Security Enterprise by visiting the interactive Presidential Nuclear History page.