Which retail innovation did military exchanges (PX/BX) implement in the 1980s, years before it became standard in civilian retail stores?

The military exchange system has a fascinating retail history that many civilians never experience. Post Exchange (PX) and Base Exchange (BX) stores have evolved from simple sutlers' tents during the American Civil War to sophisticated retail operations serving military personnel worldwide. These unique retail environments have pioneered innovations that later influenced civilian retail. Test your knowledge about a groundbreaking retail strategy that military exchanges implemented before mainstream civilian retailers.

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Barcode scanning at checkout counters
Unified global pricing strategy across all locations
Self-checkout kiosks
Customer loyalty card programs