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In this July 1, 1968, photo U.S. Ambassador Llewellyn E. Thompson, left, signs the Nuclear Non-Proliferation Treaty as co-signer, Soviet Foreign Minister Andrei A. Gromyko, right, watches in Moscow, Russia. The landmark treaty signed by 61 countries is turning out to be more successful than predicted in keeping the nuclear weapons club small. Standing, left to right are the U.S. Embassys' Political Counselor David Klien, Scientific Attache Christopher Squire, Political Officer and Chief Translator Alexander Akalovsky, Soviet Premier Alexei N. Kosygin, unidentified Soviet Translator, and Soviet Defense Minister Andrei A Grechko, photographed in July 1968. (KEYSTONE/AP Photo/Str)