There was a group offering rides of helicopters (for a slight fee of course) at one end of the air show.
Just before the ground show, this Huey flew by. The UH-1 was developed by the Bell Aircraft Company in response to an Army request for a utility helicopter in the early 1960's. It was so numerous during the Vietnam War that it became the symbol for the war. Versions of the UH-1 are still in use.
The AH-1 Huey Cobra was developed in response to an Army need for an attack helicopter and was pretty successful in that regard.