The Sikorsky SH-60 Seahawk came as a response to the US Navy’s request for a replacement helicopter to the Kaman SH-2 Seasprite. Named S-70B before being designated as the SH-60B, Sikorsky proposed the design in the early 1970s. Sikorky got the contract in 1978 and production began immediately. The SH-60B was first flown on February 1983 and the helicopter model officially entered service in 1984. Simply put, the Seahawk was a tricked-out UH-60A. Equipped with a more powerful engine and a single-stage landing gear, the helicopter is heavily armed with advanced avionics. New armaments included a Magnetic Anomaly Detector, an APS-124 search radar, an ALQ-142 ESM system, and an infrared turret. As the Seahawk is primarily used for surface and anti-submarine warfare, most units were based in frigates and cruisers. From the SH-60B came two more versions of the Seahawk, namely: the SH-60J which Japan Maritime Self-Defense Force uses, and the more advanced SH-60K. Both these variants, however, were no longer produced by Sikorsky but by Mitsubishi under license.