#flag_officer  a senior naval officer above the rank of captain
  supertype:  commissioned_naval_officer  a commissioned officer in the navy
  subtype:  full_admiral__admiral  the supreme commander of a fleet; ranks above a vice admiral and below a fleet admiral
     instance:  William_Bligh__Bligh__Captain_Bligh  Sir_Francis_Drake__Drake__Francis_Drake  David_Glasgow_Farragut__Farragut  Viscount_Nelson__Nelson__Horatio_Nelson  Chester_William_Nimitz__Nimitz__Chester_Nimitz  Matthew_Calbraith_Perry__Perry  Hyman_George_Rickover__Rickover__Hyman_Rickover  Isoroku_Yamamoto__Yamamoto
  subtype:  fleet_admiral__fleetadmiral  an admiral of the highest rank; five-star admiral
  subtype:  rear_admiral  an admiral junior to a vice admiral
  subtype:  vice_admiral  an admiral ranking below a full admiral and above a rear admiral

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