Robert S. McNamara is not a known film actor; he was a prominent American business executive and the U.S. Secretary of Defense from 1961 to 1968. He played a key role in shaping American military policy during the Vietnam War. Before his government service, he was president of Ford Motor Company. Following his tenure at the Pentagon, he served as president of the World Bank from 1968 to 1981. His legacy includes both significant contributions to defense policies and controversial decisions during the Vietnam conflict.