Which military supply chain innovation, developed during World War II, most dramatically improved the Allied forces' ability to sustain operations in the European Theater?

Throughout history, military success has often hinged on supply chain innovations and logistics. From Alexander the Great's revolutionary supply systems to modern military supply chain management, the ability to equip and sustain forces has determined the outcome of countless conflicts. This trivia question explores a pivotal supply chain innovation that transformed warfare capability during a critical historical period.

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The Red Ball Express truck convoy system
The Liberty Ship mass production program
The Strategic Bombing Survey logistics planning
The Mulberry artificial harbors