Question: What role did the Fleet Admiral who has a class of supercarriers named after him have in World War II?

Context paragraphs:
Gato-class submarine: The "Gato"-class were a class of submarines built for the United States Navy and launched in 1941–1943; they were the first mass-production U.S. submarine class of World War II.  Together with their near-sisters the "Balao" and "Tench" class es, their design formed the majority of the United States Navy's World War II submarine fleet.  Named after the lead ship of the class, USS "Gato" , the "Gato"s and their successors formed the core of the submarine service that was largely responsible for the destruction of the Japanese merchant marine and a large portion of the Imperial Japanese Navy in World War II.  "Gato"' s name comes from a species of small catshark.  Like most other U.S. Navy submarines of the period, boats of the "Gato" class were given the names of marine creatures.  In some references, the "Gato"s are combined with their successors, especially the "Balao" class.

Ernest King: Ernest Joseph King (23 November 1878 – 25 June 1956) was Commander in Chief, United States Fleet (COMINCH) and Chief of Naval Operations (CNO) during World War II.  As COMINCH-CNO, he directed the United States Navy's operations, planning, and administration and was a member of the Joint Chiefs of Staff.  During World War II, he was the U.S. Navy's second most senior officer after Fleet Admiral William D. Leahy, who served as Chief of Staff to the Commander in Chief.

Nimitz-class aircraft carrier: The "Nimitz"-class supercarriers are a class of ten nuclear-powered aircraft carriers in service with the United States Navy.  The lead ship of the class is named after World War II United States Pacific Fleet commander Fleet Admiral Chester W. Nimitz, the U.S. Navy's last fleet admiral.  With an overall length of 1092 ft and full-load displacement of over 100,000 long tons, they have been the largest warships built and in service.

Chester W. Nimitz: Chester William Nimitz, Sr. ( ; February 24, 1885February 20, 1966) was a fleet admiral of the United States Navy.  He played a major role in the naval history of World War II as Commander in Chief, United States Pacific Fleet (CinCPac) and Commander in Chief, Pacific Ocean Areas (CinCPOA), commanding Allied air, land, and sea forces during World War II.

William Halsey Jr.: William Frederick Halsey Jr., GBE (October 30, 1882August 16, 1959), known as Bill Halsey or "Bull" Halsey, was an American admiral in the United States Navy during World War II.  He is one of the four individuals to have attained the rank of Fleet Admiral of the United States Navy.

William D. Leahy: Fleet Admiral William Daniel Leahy (May 6, 1875 – July 20, 1959) was an American naval officer who served as the senior-most United States military officer on active duty during World War II.  He held multiple titles and was at the center of all the major military decisions the United States made in World War II.

United States Fleet: The United States Fleet was an organization in the United States Navy from 1922 until after World War II.  The acronym CINCUS, pronounced "sink us", was used for Commander in Chief, United States Fleet.  This was replaced by COMINCH in December 1941, under , when it was redefined and given operational command over the Atlantic, Pacific, and Asiatic Fleets, as well as all naval coastal forces.  authorized the offices of the CNO and COMINCH to be held by a single officer; Admiral Ernest J. King was first to do so, and 1944 was promoted to the five-star rank of fleet admiral.

Essex-class aircraft carrier: The "Essex" class was a class of aircraft carriers of the United States Navy that constituted the 20th century's most numerous class of capital ships.  The class consisted of 24 vessels, which came in "short-hull" and "long-hull" versions.  Thirty-two ships were originally ordered, but as World War II wound down, six were canceled before construction, and two were canceled after construction had begun.  No "Essex"-class ships were lost to enemy action, despite several vessels sustaining very heavy damage.  The "Essex"-class carriers were the backbone of the U.S. Navy's combat strength during World War II from mid-1943 on, and, along with the addition of the three "Midway"-class carriers just after the war, continued to be the heart of U.S. naval strength until the supercarriers began to come into the fleet in numbers during the 1960s and 1970s.

National Museum of the Pacific War: The National Museum of the Pacific War is located in Fredericksburg, Texas, the boyhood home of Fleet Admiral Chester W. Nimitz.  Fleet Admiral Nimitz served as CinCPAC, Commander in Chief, United States Pacific Fleet during World War II.  The six acre site includes the Admiral Nimitz Museum which is housed in the old Nimitz Hotel and tells the story of Fleet Admiral Nimitz beginning with his life as a young boy through his naval career as well as the evolution of the old hotel.

German cruiser Admiral Hipper: Admiral Hipper, the first of five ships of her class, was the lead ship of the "Admiral Hipper" class of heavy cruisers which served with Nazi Germany's "Kriegsmarine" during World War II.  The ship was laid down at the Blohm & Voss shipyard in Hamburg in July 1935 and launched February 1937; "Admiral Hipper" entered service shortly before the outbreak of war, in April 1939.  The ship was named after Admiral Franz von Hipper, commander of the German battlecruiser squadron during the Battle of Jutland in 1916 and later commander-in-chief of the German High Seas Fleet.

Supporting paragraphs: Nimitz-class aircraft carrier Chester W. Nimitz
Answer: Commander in Chief, United States Pacific Fleet (CinCPac) and Commander in Chief, Pacific Ocean Areas (CinCPOA)