What country was "secretly" bombed by the United States during the Vietnam War?

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During the Vietnam War, the United States secretly bombed Cambodia in an effort to disrupt enemy supply lines and bases. The bombing campaign, known as Operation Menu, started in 1969 and continued until 1973. The secret bombing of Cambodia was controversial at the time and remains a contentious issue in historical discussions of the Vietnam War.

What Country Was "Secretly" Bombed by the United States During