Which retail innovation was first widely implemented in military PX stores during the Vietnam War era that revolutionized product inventory tracking?

The Post Exchange (PX) system represents one of the world's most unique retail operations, serving military personnel and their families worldwide. This specialized retail network has evolved significantly since its inception, incorporating advanced retail analytics and customer loyalty programs. Test your knowledge about how the military has innovated its retail operations to serve those who serve.

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Universal Product Code (UPC) barcode scanning system
RFID tag inventory tracking
Computerized customer loyalty cards
Electronic point-of-sale (EPOS) terminals