Which inventory management technology was first widely implemented by the U.S. military in Post Exchanges (PX) during the 1970s, decades before becoming standard in civilian retail?

Military Post Exchanges (PX) have evolved dramatically throughout history, from basic commissaries to sophisticated retail operations. They've pioneered inventory management techniques that later influenced civilian retail. This poll tests your knowledge about a significant technological innovation in military retail operations that changed how military supplies and personal items were tracked and distributed to troops worldwide - with implications for modern retail inventory systems.

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Radio Frequency Identification (RFID) tagging for equipment tracking
Barcode scanning systems using Universal Product Code (UPC)
Computerized inventory forecasting using linear programming
Just-in-time inventory systems with automated reordering