During the Vietnam War, the U.S. Joint Chiefs of Staff considered and rejected some additions to strategic bombing campaigns that would include targeting a series of dikes and dams along Vietnam's Red River delta. A classified 1965 USAF report suggested that the Red River flood control system could probably not be destroyed by conventional aerial bombing. In 1966, John McNaughton, Secretary of Defense for International Security Affairs, proposed the destruction of the Red River Valley dams and dikes in order to flood rice paddies, disrupt the North Vietnamese food supply, and leverage Hanoi during negotiations; then-Secretary of Defense Robert McNamara, however, rejected the idea. (en)