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This is a Notable Operational milestone.
The aircraft would subsequently be ordered by the U.S. Army (in June 1963), carrying the initial designation of YCH-54A Tarhe. The aircraft was preceeded by the reciprocating engine powered Sikorsky S-60.
Source: "The American Helicopter: An Overview of Helicopter Developments in America 1908-1999," Michael J. Hirschberg, July 2000, Page 38
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