This compilation of recently declassified documents, the vast majority of them published here either for the first time or in less excised form than previously, details the nuclear weapons policies of the Nixon and Ford administrations – a critical period in the nuclear age that is vital for understanding the developments of subsequent years. It is the second part of a series by the Archive on U.S. nuclear history. Among other focuses, the set details the Nixon administration’s policy of pursuing technological advantage after the Soviet Union succeeded in reaching parity in strategic forces.