Submarine Warfare in the Pacific - The History of the Fighting Under the Waves between Japan and America during World War II

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Submarines exercised a decisive impact on the outcome of the Pacific Theater in World War II. The U.S. submarine fleet, largely though not exclusively under the overall command of Vice Admiral Charles Lockwood, strangled the supply lines and shipping traffic of the Empire of Japan. Their commerce raiding crippled both Japan's ability to keep its frontline units supplied and to manufacture the weapons, vessels, and vehicles needed to successfully carry on the struggle. The United States and Japan both produced excellent, high-tech submarines in the context of the World War II era. Japanese I-boats showed excellent seakeeping capabilities and offered the versatility created by their large size, including the ability to serve as motherships for midget submarines or aircraft carriers for scouting aircraft or even specialized bombers. The Type 93 Long Lance and Type 95 torpedoes they carrier packed enough punch to sink capital ships like battleships and carriers at ranges of several miles.
American submarines, though smaller, could dive deeply, move quickly, and provide both firepower and survivability. Though their Type XIV and Type XVIII torpedoes could not match the Japanese Type 93, they still gave a lethal punch, particularly after improvements in late 1943. The USS Archerfish demonstrated the deadliness of American submarines to Japanese capital ships also.
The submariners of both fleets showed immense courage, daring, and skill in carrying out their duties. Both groups of men exhibited aggression, patriotism, and fighting spirit in equal measure, regardless of the different cultural lenses through which these traits manifested themselves. Both navies successfully produced professional, highly capable submarine officers.
The Japanese, however, decided to use their submarines mainly to support a grand fleet action at visual ranges, which never occurred. Instead, the submarines carried out sporadic, uncoordinated attacks and the rest of the time remained on sentry duty or found their time squandered with supply
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