Which retail technology was FIRST implemented by the Army & Air Force Exchange Service (AAFES) before becoming widespread in civilian retail?

The modern military shopping experience has evolved significantly over the decades. Post Exchanges (PX) and Base Exchanges (BX) represent one of the most unique retail systems in the world, combining military logistics with consumer retail. This poll tests your knowledge about the technological evolution and historical significance of military retail operations that serve millions of active duty personnel, veterans, and their families worldwide.

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RFID inventory tracking systems (1997)
Barcode scanning at point-of-sale (1972)
Self-checkout kiosks (2003)
Electronic shelf labeling (1994)