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July the 4th we had a huge convoy of helicopters and military air support flying over. They were flying low. Fly in different formations. Then we realized after a while what was going on. President Bush was speaking at Mountpelier and it was the security and the presidential helicopter being...

Mapping is done by sattelite. It could be a land survey.

It is often easier for heavy equipment to be moved by helicopter than by loading it in a truck and taking it to a place that is not very accessable. You are probably seeing peices of a tower being moved.