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Following those two compound helicopters was the Sikorsky Autonomous Research Airfcraft, an S-76B called SARA, which is being used to develop the autonomous pilot-assist technologies that form the backbone of the avionics systems for the two military prototypes.
With only a safety pilot on board, Secretary of the Army Ryan McCarthy and Sen. Tammy Duckworth were able to operate SARA through a takeoff, flight and autonomous landing using a pair of iPads from a nearby reviewing stand.