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The Sikorsky H-19 Chickasaw, was a multi-purpose helicopter used by the United States Army and United States Air Force. It was also license-built by Westland Aircraft as the Westland Whirlwind in the United Kingdom. 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=231318