In the late 19th century, European militaries had come to appreciate that thoroughly-trained and well-handled dogs could perform useful military services, such as finding wounded soldiers on the battlefield and guarding military installations and outposts. Over the course of the 20th century, new roles were found for them: notably, detecting mines and explosives during World War II.
Given the success achieved with dogs, it was perhaps inevitable that experiments would begin with other intelligent and trainable animals, including marine mammals. The earliest of these experiments took place during World War I, when Britain’s Royal Navy unsuccessfully attempted to train sea lions to locate German submarines.
The early training – conducted at a facility on Lake Bala in Gwynedd, Wales – went well. But once the sea lions were released into the open sea, they were generally found to be more interested in pursuing shoals of fish than U-boats – much to the frustration of the officers involved.
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In coldly scientific language – and with little acknowledgement of the sophisticated intelligence and capacity for emotion expressed by these animals – one American manufacturer of military sonar equipment described them as:
Self-propelled marine vehicle[s], or platform[s]; with a built-in sonar sensor system suitable for detecting and classifying targets; and carrying an on-board computer … capable of being programmed for complex performance.
The Yamato battleship is the pinnacle of the battleship type. The biggest battleship in the world, and the best known Japanese Navy ship. Sadly remembered for her defeat in her last battle against 227 American aircraft, which became a demonstrative execution and ended with the giant being defeated and the hopes of the Japanese command crashed. Built in secret, and at great expense, she emerged as the largest battleship in history. Born to terrify her enemies, she'd cost eight billion USD to build in today's dollars. She represents the pinnacle of battleship building, but launched at a key turning point in naval warfare history. The rise of aircraft-based naval combat left her immensely powerful, but ill-equipped to fight sustained air attacks.
Yamato (大和) was the lead ship of her class of battleships built for the Imperial Japanese Navy (IJN) shortly before World War II. A great effort was made in Japan to ensure the ships were built in extreme secrecy to prevent American intelligence officials from learning of their existence and specifications. She and her sister ship, Musashi, were the heaviest and most powerfully armed battleships ever constructed, displacing 72,800 tonnes at full load and armed with nine 46 cm (18.1 in) Type 94 main guns, which were the largest guns ever mounted on a warship.
Named after the ancient Japanese Yamato Province, Yamato was designed to counter the numerically superior battleship fleet of the United States, Japan's main rival in the Pacific. She was laid down in 1937, launched on 8 August 1940, with Captain (later Vice-Admiral) Miyazato Shutoku in command, and formally commissioned a week after the Pearl Harbor attack in late 1941. Throughout 1942, she served as the flagship of the Combined Fleet, and in June 1942 Admiral Isoroku Yamamoto directed the fleet from her bridge during the Battle of Midway, a disastrous defeat for Japan. Musashi took over as the Combined Fleet flagship in early 1943, and Yamato spent the rest of the year, and much of 1944, moving between the major Japanese naval bases of Truk and Kure in response to American threats. Although present at the Battle of the Philippine Sea in June 1944, she played no part in the battle.
The only time Yamato fired her main guns at enemy surface targets was in October 1944, when she was sent to engage American forces invading the Philippines during the Battle of Leyte Gulf. While threatening to sink American troop transports, they encountered a light escort carrier group of the U.S. Navy's Task Force 77, "Taffy 3", in the Battle off Samar. The Japanese turned back after American air attacks convinced them they were engaging a powerful US carrier fleet.
During 1944, the balance of naval power in the Pacific decisively turned against Japan, and by early 1945, its fleet was much depleted and badly hobbled by critical fuel shortages in the home islands. In a desperate attempt to slow the Allied advance, Yamato was dispatched on a one-way mission to Okinawa in April 1945, with orders to beach herself and fight until destroyed, thus protecting the island. The task force was spotted south of Kyushu by US submarines and aircraft, and on 7 April 1945 she was sunk by American carrier-based bombers and torpedo bombers with the loss of most of her crew.
Anti-Access/Area Denial (or > A2/AD >>) is [an asymmetric] military strategy to control access to and within an operating environment. In an early definition, anti-access refers to those actions and capabilities, usually long-range, designed to prevent an opposing force from entering an operational area. Area denial refers to those actions and capabilities, usually of shorter range, designed to limit an opposing force's freedom of action within the operational area. In short, A2 affects movement to a theater, while AD affects movement within a theater. A2/AD typically refers to a strategy used by a weaker opponent to defend against an opponent of superior skill, although a stronger opponent can also use A2/AD.