START I, a bilateral treaty between the United States of America and the Union of Soviet Socialist Republics (USSR) signed on 31 July 1991
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By 1992, the Soviet Union had collapsed, 12 Ohio-class submarines had been commissioned, and the START I treaty had gone into effect, so the 31 older Poseidon- and Trident I-armed SSBNs were disarmed, withdrawing Poseidon from service.