Neil Sheehan, Vietnam Archive: Pentagon Study Traces 3 Decades of Growing U.S. Involvement. The New York Times, 13 June 1971. “A massive study of how the United States went to war in Indochina, conducted by the Pentagon three years ago, demonstrates that four administrations progressively developed a sense of commitment to a non- Communist Vietnam, a readiness to fight the North to protect the South, and an ultimate frustration with this effort–to a much greater extent than their public statements acknowledged at the time.”