Westland Sea King Mk50 of 817 Squadron, RAN
The Royal Australian Navy operated the Sea King for over 30 years however the RAN's version was not the American SIkorsky H-3, but rather the British variant.
The following is from Wikipedia which brings to light an interesting comment from renowned aviation writere, Gerald Frawley about how the RN and RAN operated its aircraft.
Westland Helicopters, which had a long-standing licence agreement with Sikorsky Aircraft to allow it to build Sikorsky's helicopters, extended the agreement to cover the Sikorsky SH-3 Sea King soon after the Sea King's first flight in 1959.Westland proceeded to independently develop the Sea King, integrating a significant proportion of components from British suppliers; key changes include the use of a pair of Rolls-Royce Gnome turboshaft engines and the implementation of an automatic flight control system.On this matter, authors Jim Thorn and Gerald Frawley stated that: "Despite appearances, Westland's Sea King [is a] very different aircraft from Sikorsky's".Many of the differences between the Westland-built Sea King and the original helicopter were as a result of differing operational doctrine. While the U.S. Navy Sea Kings were intended to be under tactical control of the carrier from which they operated, the Royal Navy intended its helicopters to be much more autonomous, capable of operating alone, or coordinating with other aircraft or surface vessels. This resulted in a different crew arrangement, with operations being controlled by an observer rather than the pilot, as well as fitting a search radar.
The aircraft served Australia well, but its final years
were marked by controversy after an accident on the Indonesian island of
Nias that claimed the lives of nine ADF members resulted in an early
retirement of the type ouf of Navy service.