USS Spearfish (SS-190), a Sargo-class submarine, was the only ship of the United States Navy to be named for the spearfish, any of several large, powerful, pelagic fishes of the genus Tetrapturus allied to the marlins and sailfishes.
USS Pollack (SS-180), a Porpoise-class submarine, was the first ship of the United States Navy to be named for the pollack, a food fish resembling the true cod, but with the lower jaw projecting and without the barbel.
Operation K was a Japanese naval operation in World War II, intended as reconnaissance of Pearl Harbor and disruption of repair and salvage operations following the surprise attack on 7 December 1941. It culminated on 4 March 1942, with an unsuccessful attack carried out by two Kawanishi H8K "Emily" flying boats. This was the longest distance ever undertaken by a two-plane bombing mission, and one of the longest bombing sorties ever planned without fighter escort.
I-26 was an Imperial Japanese Navy B1 type submarine commissioned in 1941. She saw service in the Pacific War theatre of World War II, patrolling off the West Coast of Canada and the United States, the east coast of Australia, and Fiji and in the Indian Ocean and taking part in Operation K, preparatory operations for the Aleutian Islands campaign, and the Guadalcanal campaign, the Marianas campaign, and the Battle of Leyte Gulf. She was the first Japanese submarine to sink an American merchant ship in the war, sank the first ship lost off the coast of State of Washington during the war, damaged the aircraft carrier USS Saratoga (CV-3), sank the light cruiser USS Juneau (CLAA-52), and was the third-highest-scoring Japanese submarine of World War II in terms of shipping tonnage sunk. Her bombardment of Vancouver Island in 1942 was the first foreign attack on Canadian soil since 1870. In 1944, I-26′s crew committed war crimes in attacking the survivors of a ship she sank. She was sunk in October 1944 during her ninth war patrol.
Katori (香取) was the lead ship of the Katori class of three light cruisers which served with the Imperial Japanese Navy during World War II. The ship was named after the noted Shinto Katori Shrine in Chiba prefecture, Japan.
The 6th Fleet was a fleet of the Imperial Japanese Navy (IJN) that during World War II, had primary responsibility for the command of submarine operations.
I-15 was an Imperial Japanese Navy B1 type submarine commissioned in 1940 that served during World War II. She supported the Japanese attack on Pearl Harbor, operated off the United States West Coast, and took part in Operation K-1, the Aleutian Islands campaign, and the Guadalcanal campaign, including the Battle of the Eastern Solomons and the Battle of the Santa Cruz Islands, before she was sunk in November 1942 during her fourth war patrol.
I-74, later I-174, was an Imperial Japanese Navy Kaidai type cruiser submarine of the KD6B sub-class commissioned in 1938. During World War II, she took part in the attack on Pearl Harbor, the Battle of Midway, the Guadalcanal campaign, the New Guinea campaign, and the Gilbert and Marshall Islands campaign and operated off Australia before she was sunk during her ninth war patrol in 1944.
I-9 was an built for the Imperial Japanese Navy Type A1 submarine commissioned in 1941. She saw service during World War II, including operations related to the attack on Pearl Harbor, a patrol off the United States West Coast, and in Operation K. She also took part in the Aleutians campaign and the Guadalcanal campaign before she was sunk in June 1943.
I-10 was an Imperial Japanese Navy Type A1 submarine that served during World War II. Designed as a submarine aircraft carrier, she was commissioned in 1941 and supported the attack on Pearl Harbor, operated in the Indian Ocean — including support for the 1942 midget submarine attack on Diego Suarez — and in the New Caledonia and New Zealand areas, and took part in the Guadalcanal campaign and Marianas campaign before she was sunk in 1944 during her seventh war patrol.
Yasukuni Maru (靖国丸) was a Japanese ocean liner owned by Nippon Yusen Kaisha (NYK). The ship was launched in 1930 by Mitsubishi Shipbuilding & Engineering Co. at Nagasaki, on the southern island of Kyūshū, Japan, entering service in 1930. The ship was named for the Yasukuni Shrine, a famous Shinto shrine dedicated to the war dead of Japan, located in Tokyo.
I-73 was an Imperial Japanese Navy Kaidai type cruiser submarine of the KD6A sub-class commissioned in 1937 that served during World War II. One month after participating in the Japanese attack on Pearl Harbor, she was sunk by the United States Navy submarine USS Gudgeon (SS-211) in January 1942.
I-75, later I-175, was an Imperial Japanese Navy Kaidai-type cruiser submarine of the KD6B sub-class commissioned in 1938. During World War II, she took part in the attack on Pearl Harbor, the Battle of Midway, the Guadalcanal campaign, the Aleutian Islands campaign, and the Gilbert and Marshall Islands campaign and operated off Australia, before she was sunk in 1944 during her tenth war patrol. She is best known for sinking the United States Navy escort carrier USS Liscome Bay on 24 November 1943.
I-70 was an Imperial Japanese Navy Kaidai-type cruiser submarine commissioned in 1935. While supporting the Japanese attack on Pearl Harbor at the beginning of the Pacific campaign of World War II in December 1941, she was sunk on the third day of the war, the first fleet submarine lost in the Pacific during the war.
I-72, later I-172, was a Kaidai-class cruiser submarine of the KD6 sub-class built for the Imperial Japanese Navy (IJN) during the 1930s. She served in the early months of World War II, supporting the attack on Pearl Harbor, patrolling in Hawaiian waters in early 1942, and taking part in the Guadalcanal campaign before she was sunk in November 1942.
I-69, later I-169, was an Imperial Japanese Navy Kaidai-class cruiser submarine of the KD6 sub-class commissioned in 1935. She served in World War II, during which she conducted six war patrols and took part in operations supporting the attack on Pearl Harbor, the Battle of Midway, the Guadalcanal campaign, the Aleutians campaign, and the defense of the Gilbert Islands. She sank in a diving accident in April 1944.
I-71, later I-171, was a Kaidai-class cruiser submarine of the KD6 sub-class built for the Imperial Japanese Navy during the 1930s. She served in World War II, and took part in operations supporting the attack on Pearl Harbor, the Battle of Midway, and the Aleutian Islands campaign. She was sunk in February 1944.
I-123, originally named Submarine No. 50 then renamed I-23 from before her construction began until June 1938, was an I-121-class submarine of the Imperial Japanese Navy that served during the Second Sino-Japanese War and World War II. During the latter conflict, she conducted operations in support of the Japanese invasion of the Philippines, the Battle of Midway, the Guadalcanal campaign, and the Battle of the Eastern Solomons. She was sunk in 1942.
I-3 was an Imperial Japanese Navy J1 type submarine commissioned in 1926. She was a large cruiser submarine. She served in the Second Sino-Japanese War and World War II. During the latter conflict she operated in support of the attack on Pearl Harbor, conducted anti-shipping patrols in the Indian Ocean, supported the Indian Ocean raid, and took part in the Aleutian Islands campaign and the Guadalcanal campaign before she was sunk in December 1942.
I-18 was one of five Type C cruiser submarines of the C1 sub-class built for the Imperial Japanese Navy. During World War II, she operated as the mother ship for a midget submarine during the attack on Pearl Harbor and the attack of Diego-Suarez, conducted a war patrol in the Indian Ocean, and served in the Guadalcanal campaign before she was sunk in February 1943.
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