If you were ever extracted from a bad situation on a Huey, you have fond memories of them, I do. The "Yards" in Vietnam did not have a word for "Helicopter" so would say "My Bai Woop Woop" the My Bai being airplane, not sure I spelled that correctly. The distinctive sound of a Huey is hard to forget. In Thailand, I do not remember how many times I heard that "Woop Woop" sound coming and go out to see the Huey we were expecting, but it was a Thai Farm vehicle with a single cylinder, Kubota Diesel engine. They had a very basic, 4 wheel vehicle to drive to the fields, and then you could take that Diesel engine off the vehicle, and hook it up to a water pumping system to irrigate the rice paddies. John