McNamara Line

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The McNamara Line was a defensive line created by the United States during the Vietnam War to prevent inflitration of South Vietnam by NVA forces. The plan was announced by Robert McNamara in September 1967, when it became clear that Operation Rolling Thunder was not proving effective in damaging North Vietnam's military industry. It would consist of a 20,000 air dropped listening devices combined with 240,000,000 Gravel mine and 300,000,000 Button mines and 19,200 Sadeye cluster bombs at a cost of around one billion dollars a year, not including 1.6 billion dollars for research and development, and the construction of a 600 million dollar command centre in Thailand.

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