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Step-by-step explanation:
Robert McNamara was the United States secretary of defense from 1961 to 1968. He served under President John Kennedy and president Johnson.
In November 1965, Robert McNamara, who was an ardent supporter and key strategist of the Vietnam war, began to have doubts about the war. He told a press conference that the war is going to be a long one, in contradiction to his previous statements supporting the actions taken to end the war, early. During the Honolulu conference in February 1966, McNamara told a group of journalists that the Operation Rolling Thunder was a failure and that no amount of bombings can end the war.
McNamara's views were an indictment to the leadership of the US military. The secretary of defense answering the president and the American people, has a role to offer helpful advice in the time of conflict. If they're not ready to serve a hundred percent due to their beliefs, they should leave the office so as not to sabotage the process.