Question: What communications officer was on the staff of a fleet admiral in the United States Navy?

full_context: Document 1: Erich Raeder during World War II: Erich Johann Albert Raeder (24 April 1876 – 6 November 1960) was a naval leader in Germany who played a major role in the Naval history of World War II. Raeder attained the highest possible naval rank—that of "Großadmiral" (Grand Admiral) — in 1939, becoming the first person to hold that rank since Alfred von Tirpitz. Raeder led the "Kriegsmarine" (German War Navy) for the first half of the war; he resigned in 1943 and was replaced by Karl Dönitz. He was sentenced to life in prison at the Nuremberg Trials, but was released early due to failing health. Raeder is also well known for dismissing Reinhard Heydrich from the Reichsmarine in April 1931 for "conduct unbecoming to an officer and a gentleman".
Document 2: Interwar naval service of Erich Raeder: Erich Johann Albert Raeder (24 April 1876 – 6 November 1960) was a naval leader in Germany before and during World War II. Raeder attained the highest possible naval rank—that of "Großadmiral" (Grand Admiral) — in 1939, becoming the first person to hold that rank since Alfred von Tirpitz. Raeder led the "Kriegsmarine" (German War Navy) for the first half of the war; he resigned in 1943 and was replaced by Karl Dönitz. He was sentenced to life in prison at the Nuremberg Trials, but was released early due to failing health. Raeder is also well known for dismissing Reinhard Heydrich from the Reichsmarine in April 1931 for "conduct unbecoming to an officer and a gentleman".
Document 3: 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.
Document 4: Ernest J. King Professor of Maritime History: In May 1948, the President of the Naval War College Admiral Raymond Spruance recommended a plan to establish a civilian professorship of maritime history at the Naval War College. Approved by Secretary of the Navy John L. Sullivan (Navy) on 29 December 1948, the post was not filled “for lack of funds” until 1951, when Thomas C. Mendenhall of Yale University was appointed to the position. In 1953, Secretary of the Navy Robert Bernard Anderson named the chair in honor of Fleet Admiral Ernest J. King, recognizing King’s great personal interest in maritime history. The Ernest J. King chair was named and first filled during the tenure of Professor Clarence H. Haring. At that point, there was only one other named academic chair in the United States for the field of maritime history, that held by the Gardiner Professor of Oceanic History and Affairs established at Harvard University in 1948.
Document 5: 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.
Document 6: Thomas C. Kinkaid: Thomas Cassin Kinkaid (3 April 1888 – 17 November 1972) served as an admiral in the United States Navy during World War II. He built a reputation as a "fighting admiral" in the aircraft carrier battles of 1942 and commanded the Allied forces in the Aleutian Islands Campaign. He was Commander Allied Naval Forces and the Seventh Fleet under General of the Army Douglas MacArthur in the Southwest Pacific Area, where he conducted numerous amphibious operations, and commanded an Allied fleet during the Battle of Leyte Gulf, largest naval battle of World War II and the last naval battle between battleships in history.
Document 7: 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.
Document 8: 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.
Document 9: 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.
Document 10: Battle of Midway: The Battle of Midway was a decisive naval battle in the Pacific Theater of World War II which occurred between 4 and 7 June 1942, only six months after Japan's attack on Pearl Harbor and one month after the Battle of the Coral Sea. The United States Navy under Admirals Chester Nimitz, Frank Jack Fletcher, and Raymond A. Spruance defeated an attacking fleet of the Imperial Japanese Navy under Admirals Isoroku Yamamoto, Chuichi Nagumo, and Nobutake Kondo near Midway Atoll, inflicting devastating damage on the Japanese fleet that proved irreparable. Military historian John Keegan called it "the most stunning and decisive blow in the history of naval warfare."
Document 11: Fleet admiral (United States): Fleet admiral (abbreviated FADM), officially known as "Fleet Admiral of the United States Navy", is a five-star flag officer rank in the United States Navy. Fleet admiral ranks immediately above admiral and is equivalent to General of the Army and General of the Air Force. Although it is a current and authorized rank, no U.S. Navy officer presently holds it, with the last living U.S. Navy fleet admiral being Chester W. Nimitz, who died in 1966.
Document 12: John R. Redman: John "Jack" Roland Redman (January 31, 1898 – May 29, 1970) was an admiral in the United States Navy. A naval communications officer, he played key roles in signals intelligence during World War II in Washington, D.C., and on the staff of Admiral Chester W. Nimitz.
Document 13: Frederic John Walker: Captain Frederic John Walker, (3 June 1896 – 9 July 1944) (his first name is given as Frederick in the Oxford Dictionary of National Biography and some London Gazette entries) was a Royal Navy officer noted for his exploits during World War II. Walker was the most successful antisubmarine warfare commander during the Battle of the Atlantic and was known more popularly as Johnnie Walker (for the Johnnie Walker brand of whisky).
Document 14: 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.
Document 15: Japanese naval codes: The vulnerability of Japanese naval codes and ciphers was crucial to the conduct of World War II, and had an important influence on foreign relations between Japan and the west in the years leading up to the war as well. Every Japanese code was eventually broken, and the intelligence gathered made possible such operations as the victorious American ambush of the Japanese Navy at Midway (JN-25b) and the shooting down of Isoroku Yamamoto in Operation Vengeance.
ground_truth: John "Jack" Roland Redman