Which retail payment technology was first widely implemented by U.S. military commissaries and exchanges in the 1990s, several years before becoming common in civilian retail?

The military has pioneered many technologies and systems that later became civilian standards. One significant but often overlooked contribution is in retail payment systems. The Department of Defense developed sophisticated retail operations to serve personnel worldwide, sometimes creating solutions that later influenced civilian retail. This trivia question explores a fascinating intersection of military logistics and retail innovation.

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Contactless RFID payment cards
Biometric payment authentication (fingerprint scanning)
Mobile phone payment applications
Self-checkout kiosks