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Robert Strange McNamara (June 9, 1916 – July 6, 2009) was an American businessman and government official who served as the eighth United States secretary of defense from 1961 to 1968 under presidents John F. Kennedy and Lyndon B. Johnson. He remains the longest-serving secretary of defense, having remained in office over seven years. He played a major role in promoting the U.S.'s involvement in the Vietnam War. Wikipedia