"Ahu" are stone platforms on which many moai sit. There are 313 known ahu and 125 of these carry moai. The biggest, Ahu Tongariki is 220 m (720 ft), and had the most (15) and tallest moai.
The Vietnam War required us to emphasize the national interest rather than abstract principles. What President Nixon and I tried to do was unnatural. And that is why we didn't make it.