Which retail analytics innovation was first widely implemented in U.S. military exchanges (PX/BX) during the post-Vietnam War era to combat inventory shrinkage?

Military exchanges (PX/BX stores) have been a vital part of military life for over a century, providing essential retail services to service members and their families worldwide. These unique retail operations have evolved dramatically, from simple trading posts to billion-dollar retail enterprises with sophisticated supply chain management. This trivia question explores how military retail analytics transformed during a critical period of military history.

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Electronic Article Surveillance (EAS) tags
Barcode scanning inventory systems
Closed-circuit television monitoring
Computerized point-of-sale systems