Two decades after the Vietnam War ended, which former secretary of defense regretted that the United States had entered the conflict?

Question

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Robert McNamara, who served as the Secretary of Defense during the Vietnam War, publicly expressed his regret over the United States' involvement in the conflict in his later years, particularly in his 1995 memoir, "In Retrospect: The Tragedy and Lessons of Vietnam."

Two Decades After the Vietnam War Ended, Which Former Secretary