In a society any less dynamic and complex, David Halberstam might never have found a place; he might have wandered the hills as a holy madman. He believed it was his personal destiny to feel the first impact of changing currents in national life. He went where the action was, kept his face turned to the wind. That meant Mississippi first, to cover civil rights, then Vietnam, then into the New York media scrum, which he maybe loved too much. His self-conception was always grand, sometimes risibly so. But in the turbulence of mid-20th-century America, he found a challenge equal to the scale of his ambition.