The Sikorsky SH-3 Sea King (company designation S-61) is an American twin-engined anti-submarine warfare (ASW) helicopter designed and built by Sikorsky Aircraft. It was a landmark design, being the first ASW helicopter to take advantage of turboshaft engines, as well as being the first amphibious helicopter in the world. Introduced in 1961, it served with the United States Navy, and remains in service in many countries around the world. 	
http://en.wikipedia.org/wiki/SH-3D
