 By 1979 , the Royal Navy had ordered 56 HAS1s and 21 HAS2s to meet the anti @-@ submarine requirements , these were also configured for the secondary anti @-@ ship role . The Westland Sea King was updated and adapted for numerous roles , subsequent variants include the HAS2 , HAS5 and HAS6 . Changes from initial production aircraft included an expansion of the cabin and upgraded engines . 
