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Just a possibility.... Is the high school building large? like a lot of roof? It is possible the tractor trailer had a sliding canvas top and was carrying some air handlers. The helicopter is sometimes the cheapest way to set them on a roof if the roof is so vast a crane can't reach.
originally posted by: Vroomfondel
The chopper was not military and had no visible N number on it that I could see. It was strange enough to see the helicopter landing behind the high school, which is now out for summer vacation. But I also saw two men in military fatigues climbing in to a semi tractor trailer that was all white, hauling an all white trailer behind it.