The Japanese battleline in WWII was not the most modern in the world...
The IJN had 4 Kongo-class battleships launched in 1912/13 and refitted in 1936. They were the fastest of the IJN's BB at 30.5 knots. They weighed in at 31,720 tons and were armed with 4 twin mounted 14-inch guns, 14 single mounted 6-inch guns (later lowered to 8), 4 twin 5-inch DP guns (increased to 6 twin mounts) and 20 25mm AA guns (increased to 94).
Two Fuso-class battleships launched in 1914/15 and displacing 34,700 tons and with a speed of 24.75 knots. Armed with 6 twin 14-inch guns, 14 single mount 6-inch guns, 4 twin mount 5-inch DP guns and 16 25mm AA guns (later increased to 37) The IJN modernizied them in 1932 but considered them to be too slow for front line use.
Two Ise-class battleships launched in 1916/17 and displacing 36,000 tons and with a speed of 25.25 knots. Initially armed with 6 twin 14-inch guns, 16 single mount 5.5-inch guns, 4 twin 5-inch AA guns and 20 25mm AA guns. After the disaster at Midway, the IJN converted these two into hybrid battleship-seaplane carriers. The armament was changed to 4 twin 14-inch, 8 twin 5-inch DP guns and 57 25mm AA guns as well as 22 seaplanes.
Two Nagato-class battleships launched in 1919/1920 and displacing 39,130 tons and with a speed of 25 knots. Armed with 4 twin 16-inch guns, 18 single 5.5-inch guns (lowered to 16), 4 twin 5-inch DP guns and 20 25mm AA guns (increased to 98).
And finally the two Yamato-class battleships, launched in 1940 and displacing 71,659 tons and with a speed of 27.5 knots. Armed with 3 triple 18-inch guns, 4 triple 6.1-inch guns (reduced to two mounts), 6 twin 5-inch DP guns (increased to 12 twin mounts) and 24 25mm AA guns (increased to 146 25mm).
Unlike the USN, the IJN fought the war with older battleships, most of whom were modernized in the 1930s and later had refits with radar and increased numbers of light AA guns. Of the twelve BBs they started the war with; 2 were sunk in 1942; 1 in 1943; 4 in 1944; 4 in 1945; 1 in 1946. Ten were sunk by US forces, one by an accidental magazine explosion and one survived the war, only to be a target at the Bikini nuclear bomb test.
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The reason that the American Army does so well in wartime, is that war is chaos, and the American Army practices chaos on a daily basis.
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