I would disagree with some of those...
The Fu-Go balloon was unsuccessful because the US didn't let anyone know that they were landing on US soil so the Japanese abandoned the idea. The balloons did succeed in providing a cheap method of delivering ordnance in to the continental US- I hate to think what could have happened if the Japanese decided to put some of the chemical or biological weapons they used in China on one.
M-388... this one always comes up doesn't it? Personally its one of my favorite weapons ever! They get it wrong when they say it would render vast areas uninhabitable, the yield of the bomb was quite small: .10-.20 kilotons. The weapon would only generate a fatal amount of radiation about a 1/4 mile from the blast. The warhead was latter used in the Ginnie Air to Air missile.
Chauchat Submachine Gun? Submachine Gun? I assume they meant the Chauchat Light Machine Gun. The Chauchat SMG was for tank crews to fire out of ports in their vehicles it was unsuccessful because of its overpowered cartridge. not exactly a huge failure.
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