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The Hughes OH-6 Cayuse is a single-engine light helicopter with a four-bladed main rotor used for personnel transport, escort and attack missions, and observation. Wikipedia
By U.S. Army – U.S. Army photo from the official U.S. Department of the Army publication Vietnam Studies – Airmobility 1961-1971. Washington D.C. 1989  photo , Public Domain, https://commons.wikimedia.org/w/index.php?curid=9545729