Talking about poor AAA armament during WWII...
The two worst systems had to be the USN 1.1-inch/75 quad mount and the Japanese 25mm/60 gun in any mounting.
The 1.1-inch or Chicago Piano as it was nicknamed in the fleet, well, the gun crew had a sailor whose job was to carry a sledge hammer and a chisel. His sole function was to pry loose jammed shell casings when they happened. This is one of the things that is very bad for a AAA gun when you are firing at attacking torpedo planes!
The 25mm/60 was a copy of a Hotchkiss design with a limited magazine capacity, typical twelve rounds, and an even more limited engagement zone. To add to the puzzle, the IJN had access to the British 2-pounder and the Bofors 40mm/60 designs, neither of which ever entered service with them. Instead, the IJN simply added more and more 25mm mounts.
Considering that as the war progressed, the Allies realized that the 20mm Oerklions were not effective weapons and that even the quad 40mm mounts didn't have the aircraft destruction capacity to stop Kamikazes.......one wonders just what the IJN was thinking.
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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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