Robert McNamara

American businessman and Secretary of Defense (1916-2009)

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Lived 1916–2009, aged 93United States

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Era
1916–2009
Aged 93

Summary

Updated 2026-05-29

Defense secretary who shaped Cold War strategy and Vietnam escalation across seven years under Kennedy and Johnson. McNamara brought systems analysis to policy, then spent decades reckoning with his role in the war.

Biography

About

Robert Strange McNamara, also known by his initials RSM, 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 at the height of the Cold War. 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. involvement in the Vietnam War. McNamara was responsible for the institution of systems analysis in public policy, which developed into the discipline known today as policy analysis.

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