Which inventory management technology was first widely implemented in military PX stores during the Vietnam War era before becoming standard in civilian retail?

The Post Exchange (PX) system has been a cornerstone of military life for generations, but few know about the retail technology innovations that transformed how service members shop. This trivia question explores a pivotal moment when military retail adopted a groundbreaking inventory management system that later influenced civilian retail operations worldwide. Test your knowledge about this intersection of military history and retail technology!

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Universal Product Code (UPC) barcode scanning
LOGMARS (Logistics Applications of Automated Marking and Reading Symbols)
RFID (Radio-Frequency Identification) tagging
Electronic Article Surveillance (EAS) anti-theft tags