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If they could afford to fly search planes overhead I can't see cost being the issue that prevented them from doing the search more efficiently.

> I think you will find infrared was advance enough by 1971

It was not. The link you posted says that only film infrared was available then, and that would not be helpful for searching in a jungle.

And even in 1978 the best they could do was a resolution of 64x64 which isn't enough to identify a human from an animal.