This was followed by the fielding of electronic warfare and special operations variants of the Black Hawk. Army in 1979, to replace the Bell UH-1 Iroquois as the Army's tactical transport helicopter. Named after the Native American war leader Black Hawk, the UH-60A entered service with the U.S. The Army designated the prototype as the YUH-60A and selected the Black Hawk as the winner of the program in 1976, after a fly-off competition with the Boeing Vertol YUH-61. Sikorsky submitted the S-70 design for the United States Army's Utility Tactical Transport Aircraft System (UTTAS) competition in 1972. The Sikorsky UH-60 Black Hawk is a four-blade, twin-engine, medium-lift utility military helicopter manufactured by Sikorsky Aircraft.
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