Which retail innovation was first widely implemented during World War II and revolutionized military supply distribution?

The military supply chain has evolved dramatically throughout history, transforming from basic quartermaster operations to sophisticated retail systems. Modern military procurement combines advanced technology, security protocols, and strategic retail concepts to equip forces worldwide. Test your knowledge about the fascinating intersection of retail strategies and military history in this challenging trivia question!

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Self-service stores (allowing troops to select their own supplies)
Standardized SKU systems (Stock Keeping Units for inventory tracking)
Military credit cards (for personnel to purchase approved supplies)
Automated warehousing (using early computing for supply management)