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In page Operation Ranch Hand:

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Nearly 20,000 sorties were flown between 1961 and 1971.[citation needed] The "Ranch Handers" motto was "Only you can prevent a forest"[1] – a take on the popular U.S. Forest Service poster slogan of Smokey Bear. During the ten years of spraying, over 5 million acres (20,000 km2) of forest and 500,000 acres (2,000 km2) of crops were heavily damaged or destroyed. Around 20% of the forests of South Vietnam were sprayed at least once.[5]