Sea Slug was a Royal Navysurface-to-air missile system built by Hawker Siddeley which came into service in the 1950's and was still in use at the time of the Falklands War. The missile had four boosters which seprated after launch, the main cordite motor then powered the missile to its target. Control was by radar beam riding. All the missile handling system onboard was hydraulic and this made it very manpower intensive and demanding to maintain. It has now passed out of commission by the Royal Navy.
The magazine was positioned amidships and missiles were assembled on a central gallery between the magazine and the launcher on the aft deck. During the Falklands War, Sea Slug missiles were fired onto Port Stanley airfield in addition to shelling from 4.5" guns.
Chilean Navy
A number of the County Class were sold off to Chile, the Sea Slug systems were not decomissioned until 2001.
SeaSlug was a first generation surface-to-air missile designed by Armstrong Whitworth (later part of the Hawker Siddeley group) for use by the Royal Navy.
SeaSlug Mark 1 finally entered service in 1961 on the County class destroyer fitted with a single, twin missile launcher.
SeaSlug Mark 2 was based on the aborted Blue Slug programme for a nuclear-armed anti-ship missile using the SeaSlugmissile and guidance system.