Which retail innovation was first widely deployed during World War II that revolutionized how troops accessed consumer goods in combat zones?

The Post Exchange (PX) system has been a crucial part of military life for generations, providing essential goods and services to service members and their families worldwide. But the retail innovations within this unique military shopping ecosystem have evolved dramatically over time, adapting to changing warfare conditions and troop deployment strategies. Test your knowledge about a pivotal retail innovation that transformed how military personnel accessed consumer goods during major conflicts.

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Mobile PX trucks that could reach forward operating bases
Catalog-based ordering system with battlefield delivery
Standardized military scrip currency for international purchasing
Prefabricated modular PX buildings that could be rapidly assembled