#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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