What are the four DOD nuclear weapon safety standards?

The four Department of Defense (DOD) nuclear weapon safety standards focus on preventing nuclear detonation, unauthorized launch, and accidental nuclear detonation. These standards require that nuclear weapons must always be safe from accidents, must be secure from unauthorized access, must ensure that no nuclear detonation occurs without proper authorization, and must maintain reliable performance under all conditions. These principles are fundamental to ensuring the safe handling, storage, and deployment of nuclear weapons.