The Westland Sea King originates from the American-built Sikorsky SH-3 Sea King, which was initially designed for Anti-Submarine Warfare and other naval duties. It’s an extremely versatile helicopter and has been used in a multitude of roles such as Search and Rescue (as this yellow RAF one is), troop transport and Airborne Early Warning. The type has been operated by several other countries throughout the world including Germany, India, Australia and Canada to name but a few. Yellow RAF Search