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 title is most closely associated with fighter aces, though there are other types, such as tank aces and submarine aces.
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Fighter aces
Ace of aces is a title accorded to the top flying ace/fighter ace of a nation's air force during time of war.
Submarine aces
Ace of the Deep is a title accorded to the top subsea ace/undersea ace/submarine ace of a nation's submarine force during time of war.
References
List of aces of aces Wikipedia(Text) CC BY-SA