 Pakistan 's Navy took delivery of six Mk.45 Sea Kings , a variant based on the Royal Navy 's Sea King HAS.1 from 1975 . It served in an combined anti @-@ submarine and anti @-@ ship role , carrying the Exocet missile as an alternative to the normal anti @-@ submarine weapon load of four Mark 44 or Mark 46 torpedoes . One of Pakistan 's Sea Kings was lost in an accident in February 1986 , and was replaced by an ex @-@ Royal Navy HAS.5 , redesignated Mk.45C , in January 1989 . Pakistan 's Sea Kings remained in service in December 2011 . 
