In the United States Navy, Admiral of the Navy is traditionally considered the equivalent of a six-star Admiral. The rank has only been held by one person in history: George Dewey
Sleeve Insignia for Admiral of the Navy, worn by Admiral George Dewey
The rank Admiral of the Navy gained its equivalence as a six star rank during the Second World War, with the establishment of the rank of five_star Fleet Admiral.
During the preparations for the invasion of Japan, a proposal was raised by the Navy Department to appoint Chester Nimitz to the rank of Admiral of the Navy and grant him an insignia as a six-star admiral. Proposals for the new six star rank included changing the title to "Flag Admiral". The proposal, however, was dropped and the United States Navy has never officially appointed anyone to the rank of six star admiral.
Admiral of the Navy is traditionally considered the equivalent of a six-star Admiral in the United States Navy.
It was specified that this rank was senior to the four-star rank of Admiral and was equal to Admiral of the Fleet in the British Royal Navy.
During the preparations for the invasion of Japan, a proposal was raised by the Navy Department to appoint Chester Nimitz to the rank of Admiral of the Navy and grant him an insignia as a six-star admiral.
The U.S. Navy was involved in the subsequent Cold War, in which it deployed primarily as a nuclear deterrent and crisis response force.
The Navy was a major participant in the Vietnam War, blockaded Cuba during the Cuban Missile Crisis, and through the use of ballistic missile submarines, became an important aspect of the United States' nuclear strategic deterrence policy.
The Navy is administered by the Department of the Navy, led by the Secretary of the Navy (SECNAV).