section_path: Abstract
section_name: Abstract
paragraph_text: The Sikorsky UH-60 Black Hawk is a four-blade, twin-engine, medium-lift military utility helicopter manufactured by Sikorsky Aircraft. Sikorsky submitted a design for the United States Army 's Utility Tactical Transport Aircraft System (UTTAS) competition in 1972. 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.
  
  Named after the Native American war leader Black Hawk, the UH-60A entered service with the U.S. Army in 1979, to replace the Bell UH-1 Iroquois as the Army's tactical transport helicopter. This was followed by the fielding of electronic warfare and special operations variants of the Black Hawk. Improved UH-60L and UH-60M utility variants have also been developed.
  
  Major variants include the Navy 's SH-60 Seahawk, the Air Force 's HH-60 Pave Hawk, the Coast Guard 's MH-60 Jayhawk and the civilian S-70. In addition to use by U.S. armed forces, the UH-60 family has been exported to several nations and produced under contract in Japan as the Mitsubishi H-60.