Which retail innovation was first implemented in military exchanges (PX/BX) before becoming widely adopted in civilian retail?

Throughout history, military retail has evolved dramatically. From simple commissaries to sophisticated exchanges, the way military personnel and their families shop has been transformed by technology and innovative retail strategies. This poll explores how modern retail innovations have been specifically adapted for military exchanges and commissaries worldwide. Test your knowledge about the intersection of military retail history and cutting-edge commerce technologies!

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RFID inventory tracking systems, pioneered by the Army Air Corps Supply System in 1943 and later commercialized by Walmart in the 1990s
Universal barcode system, first used in Navy commissaries in 1952, before becoming the civilian retail standard in 1974
Self-service store layouts, introduced in Army Post Exchanges in 1939, nearly a decade before Piggly Wiggly popularized them in civilian retail
Loyalty card programs, created by the Air Force Exchange Service in 1967, 14 years before American Airlines launched the first civilian loyalty program