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The Air Force in the Vietnam War - Air Force Association

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Ch<strong>in</strong>a<br />

Buffer Zone<br />

North <strong>Vietnam</strong><br />

Hanoi<br />

<strong>Air</strong> strikes around Hanoi and Haiphong were tightly constra<strong>in</strong>ed. Strikes <strong>in</strong> a prohibited<br />

zone required permission—seldom given—from Wash<strong>in</strong>gton. Limitations <strong>in</strong><br />

<strong>the</strong> restricted zone were severe and changed from week to week.<br />

<strong>The</strong> prohibited zones were 20 miles wide at Hanoi and eight miles wide at<br />

Haiphong. <strong>The</strong>y were surrounded by restricted zones, 60 miles wide at Hanoi and<br />

20 miles wide at Haiphong.<br />

Also, a buffer zone, about 25 miles wide, was established to prevent violations of<br />

<strong>the</strong> Ch<strong>in</strong>ese airspace. US aircraft could use it only to maneuver when position<strong>in</strong>g<br />

<strong>the</strong>mselves to attack targets outside <strong>the</strong> buffer zone.<br />

Restricted and Prohibited Zones<br />

Haiphong<br />

South <strong>Vietnam</strong><br />

Restricted Zone<br />

Prohibited Zone<br />

Reconnaissance aircraft photographed<br />

<strong>the</strong>se merchant vessels <strong>in</strong> Haiphong<br />

harbor.<br />

9

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