Which retail technology innovation was first widely implemented in U.S. military exchanges (PX/BX) during the Vietnam War era, dramatically improving inventory management for deployed forces?

Military exchanges (PX/BX) have evolved significantly over the centuries, providing essential goods to service members worldwide. These retail operations have a fascinating history of innovation that mirrors civilian retail development while addressing unique military needs. This trivia question explores a significant technological advancement that revolutionized military retail operations during a pivotal historical period.

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Barcode scanning systems
Punch card inventory systems
RFID tagging technology
Mechanical cash registers with inventory tracking