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The head of a naval fleet is typically referred to as the "Fleet Commander." This officer is responsible for the operational readiness and tactical effectiveness of the fleet, overseeing various ships and submarines. In some navies, this position may also be called a "Task Force Commander" if the fleet is organized into specific task forces for particular missions.
Officers are addressed either by rank (Captain, Commander, etc.), or by Sir or Ma'am as the case may be. If you know the officer, it's customary to address them by rank and name (e.g., Commander Lawless). It depends on the circumstances as well, if it's in passing, in private, or a formal meeting, unit gathering, off duty, etc.
US Naval four-star Admiral, Husband E. Kimmel was Commander-in-chief of the U.S. Pacific Fleet at the time of the Japanese attack on Pearl Harbor. He was relieved of duty as Commander in a shake-up of officers in the wake of Pearl Harbor.
The Delian League.
The commander of the First Fleet was Captain Arthur Phillip.
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George Dewey
The current Fleet Commander in Charge is Admiral William K. Lescher. Admiral Lescher assumed this position in December 2020.
Admiral Yamamoto.
COMmander of AntiSubmarine Warfare PACific fleet
Paul de grasse
The Plural of 'Fleets' is Fleets... The Singular is Fleet eg. The commander had many fleets.
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Chester W. Nimitz .
The commander in chief of a fleet
Commander, Naval Forces Europe