The famous helicopter battle where the helicopters swooped in on the village while playing "The Ride of the Valkyries" was meant to be an ironic comment on the Vietnam War.
In the original Wagner magna opera "Der Ring des Nibelungen," the Valkyries arrive at a point of apparent victory, but which later results in defeat.
Thus, the apparent victory in the helicopter battle would be followed by the eventual defeat in the war.

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