Which innovative retail technology was FIRST widely implemented in military Post Exchanges (PX) before becoming standard in civilian retail?

The Post Exchange (PX) system has been a vital part of military life for generations, providing essential goods and services to service members and their families worldwide. This trivia question explores how this unique retail innovation has evolved to serve military communities, blending traditional retail with specialized military needs. Test your knowledge about this distinctive retail system that has shaped military commerce and morale throughout history!

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Barcode scanning systems (1974)
Universal Product Code (UPC) standardization (1973)
Punch card inventory management (1951)
Self-service checkout kiosks (1992)