Which innovative military retail concept was first widely implemented during WWII to efficiently distribute standardized personal equipment and significantly improve battlefield logistics?

During major conflicts throughout history, military forces have faced significant challenges in supplying troops with necessary equipment. This led to revolutionary product design innovations in military retail systems. Test your knowledge about one of the most significant developments in military logistics that changed how armies equipped their soldiers in the field - a retail innovation that continues to influence modern military supply chains.

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The PX (Post Exchange) system with mobile units that followed front lines
QMC Form 32 requisition process for standardized equipment bundles
The 10-in-1 ration box retail concept for field distribution
The 782 Gear issue system with standardized combat equipment packages