Materials of National Security Interest

A class of strategic materials used in the development, testing, production and maintenance of nuclear weapons and other materials that have been designated as critical to our national security. This designation is primarily for fissionable nuclear material known as special nuclear material (SNM), but may include tritium. Items that contain these materials include nuclear explosives, nuclear components, special assemblies, classified assemblies, and miscellaneous SNM
parts and compounds. The Deputy Administrator for Defense Programs may also designate other special materials or items to receive the control and physical protection afforded this class of material.