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Background O S T I The US nuclear weapons program has entered a new era in its history. The first 45 years of the program were characterized by continuous weapon development supported by underground nuclear testing and a large production capability. In the last 5 years there has been no new weapon development and there is none planned for the foreseeable future, no underground nuclear tests have been conducted since September 1991 and the production complex has significantly downsized in number of plants and personnel. In this new era some old questions must be faced which have not been seriously confronted in the past. One of these questions is ‘How long can the weapons in the current stockpile be expected to last?’.

An overview of nuclear weapon stockpile lifetimes and past problems