Which retail innovation was first widely implemented by the Army & Air Force Exchange Service (AAFES) in the 1980s, decades before becoming mainstream in civilian retail?

The military exchange system, often called the PX (Post Exchange) or BX (Base Exchange), represents one of the oldest and most unique retail operations in American history. These stores have evolved from simple trading posts to sophisticated retail operations with billions in annual sales. This poll explores a significant retail innovation that transformed how military personnel and their families shop, representing an important intersection of military history and retail development.

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Biometric payment systems allowing soldiers to make purchases using fingerprint identification
Global inventory tracking systems that allowed military personnel to order products from any base worldwide
Self-checkout kiosks with barcode scanning technology
Digital loyalty cards tracking purchase history and offering personalized discounts