Tags: Aircraft.
For other uses of H19 see H19 (disambiguation).The Sikorsky H-19 Chickasaw (also known by its Sikorsky model number S-55) 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. United States Navy and United States Coast Guard models were designated HO4S while those of the U.S. Marine Corps were designated HRS. In 1962 the U.S. Navy U.S. Coast Guard and U.S.
