Ace of aces is a title accorded to the top active ace within a branch of service in a nation's military in time of war. The term ace is used for a highly successful military professional that has been accredited with: multiple enemy aircraft shot down, tanks destroyed, or ships sunk; by number or tonnage. The term was widely used for propaganda purposes during World War I, and mainly applied to a pilot who was credited with shooting down five enemy aircraft. The title is most closely associated with fighter aces, though there are other types, such as tank aces and submarine aces.
Ace of aces is a title accorded to the top flying ace of a nation's air force during time of war.
The concept of aces emerged in 1915 during World War I.
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World War II had more aces than any other war.
Top subsea ace/undersea ace/submarine ace of a nation's submarine force during time of war.
A "tank ace" or Panzer ace has been described by Historian Robert Kershaw as being the minority of tank commanders that accounted for the most destroyed enemy armor, saying it is roughly analogous with a flying ace.