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Caspar Weinberger, born on August 18, 1917, served as the United States Secretary of Defense from 1981 to 1987 under President Ronald Reagan. A prominent figure in Reagan's administration, Weinberger played a key role in shaping defense policies during the Cold War era. Weinberger's tenure was marked by the modernization of the military, efforts to counter Soviet influence, and his support for increased funding for national security.