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The Energy Department plays an important and multifaceted role in protecting national security. In addition to our work to increase nuclear nonproliferation and ensure the security of the U.S. nuclear weapons stockpile, we manage the Strategic Petroleum Reserve, invest in protections against cyber and physical attacks on U.S. energy infrastructure, conduct programs to ensure worker health and safety, and provide training tools and procedures for emergency response and preparedness. 

History of the Energy Department's Role in Nuclear Security
A timeline of nuclear security at the Department of Energy from the Manhattan Project to present day.
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National Nuclear Security Administration
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. 
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Nuclear Posture Review
America's strategy for a nuclear deterrent that is modern, robust, flexible, resilient, ready and appropriately tailored to deter 21st century threats and reassures allies. 
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Office of Cybersecurity, Energy Security, and Emergency Response
The Office of Cybersecurity, Energy Security, and Emergency Response addresses the emerging threats of tomorrow while protecting the reliable flow of energy to Americans today by improving energy infrastructure security.  
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