Which consumer product innovation was first widely adopted through military commissaries and exchanges before becoming mainstream in civilian retail?

Military exchanges (PX/BX) and commissaries have a fascinating retail history that directly impacted military families for generations. These unique retail systems evolved from simple supply depots into comprehensive shopping experiences with distinct brand identities and customer service approaches. Test your knowledge about how these military retail institutions transformed over time and their significance to military culture and readiness.

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Self-checkout kiosks (1990s)
Uniform product barcodes/UPC scanning (1974)
Store credit cards (1980s)
Online ordering with in-store pickup (2000s)