"Bell Helicopter built 10,005 Hueys from 1957 to 1975. Of the 10,005 production Hueys, 9,216 went to the U.S. Army, 127 to the U.S. Marine Corps, 79 to the U.S. Air Force and 42 to the U.S. Navy. The rest went to other countries."
Source: http://www.rrconner.com/history_of_the_huey