rounded them. For the most part, therefore, transparency and monitoring measures extended only to delivery systems (ballistic missiles and their silos, mobile and submarine launchers, strategic bombers, and cruise missiles). Agreed limits on the number of deployed strategic weapons were verified indirectly with counting rules that attributed a certain number of weapons to each deployed delivery system of a particular type. The first Strategic Arms Reduction Treaty (START I), for example, provides for a small number of inspections each year to confirm that the number of weapons on a selected ballistic missile does not exceed the number allowed for that type of missile. There have been no agreed limits on the number of strategic nuclear weapons that can be kept in storage for possible deployment, no declarations or measures to confirm the number of strategic or nonstrategic weapons in the stockpile, and the only measures to confirm that nuclear weapons have been eliminated are those being undertaken in connection with agreements concerning the disposition of highly enriched uranium from dismantled weapons.

FIGURE 2-1 Life cycle of a nuclear weapon.

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