Which wartime product innovation was initially rejected by military leadership but later became essential after experiencing a 40% failure rate during early combat deployment?

Throughout military history, certain product innovations have dramatically altered battlefield tactics and strategic capabilities. This poll examines one of the most significant product development challenges that emerged during wartime necessity. Test your knowledge about how military product innovation shaped combat effectiveness and influenced the outcome of major conflicts. Can you identify the correct technological breakthrough from among these options?

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The M1 Garand rifle, which initially jammed frequently in Pacific theater conditions but was redesigned to become the standard U.S. infantry weapon of WWII
The proximity fuse for anti-aircraft shells, which initially had dangerous premature detonations but later proved decisive against V-1 flying bombs
The Sherman tank, which suffered catastrophic fuel tank explosions until the addition of 'wet stowage' systems in later models reduced casualties
The military walkie-talkie, which initially had 40% communication failure rates in field conditions until Motorola engineers redesigned the waterproofing system