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An essential defense policy includes nuclear weapons and the super-sonic delivery system.

The fundamental physics of nuclear fission and fusion is publicly available in textbooks.

It requires weapons-grade fissile material: either highly enriched uranium (HEU) or plutonium-239. Producing these materials requires:

1. For HEU: Extremely large, complex, and energy-intensive facilities (cascades of gas centrifuges or diffusion plants).
2. For Plutonium: A nuclear reactor to irradiate uranium fuel and a sophisticated reprocessing plant to chemically separate the plutonium.

These facilities have to be hidden, possibly built underground.