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

Military exchanges (PX/BX) have evolved dramatically over the decades, from basic commissaries to sophisticated retail operations. These unique retail environments serve military personnel and their families worldwide, combining elements of civilian retail with specific military needs. This poll tests your knowledge about a significant technological advancement that transformed point-of-sale systems in military exchanges during a crucial historical period.

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LOGMARS barcode system (Logistics Applications of Automated Marking and Reading Symbols)
Punch card inventory systems
RFID tagging for high-value items
Magnetic stripe PX cards