I have a strong sense that there's a whole bunch of younger people know the name Robert McNamara in their history books, if at all. But for me, he was a frustrating man, who, as Secretary of Defense under JFK and LBJ, oversaw the increased involvement by the United States in the Vietnam conflict. (I am loath to call it a war, for as in more current offenses, there was no actual declaration of war, only a Gulf of Tonkin resolution after some dubious circumstances.) It was a war of choice, causing huge divisions in this country, some of which - see the Swiftboating of John Kerry in 2004 - have been slow to heal.
McNamara's later mea culpa hardly makes up for the harm to so many. He died on July 6 at age 93.