Which innovative retail technology was first widely deployed in military exchanges before becoming common in civilian retail?

Post Exchanges (PX) and Base Exchanges (BX) have been vital retail operations supporting military personnel and their families for generations. These specialized retail environments have evolved from simple trading posts to sophisticated retail operations with billions in annual sales. Test your knowledge about this unique military retail system that bridges military history with modern retail operations.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Barcode scanning systems (1974 in Navy Exchanges, 1980s in civilian retail)
Self-checkout kiosks (1990s in Army PX locations, 2000s in civilian retail)
RFID inventory tracking (1985 in Air Force BX facilities, 1990s in civilian retail)
Digital payment terminals (1982 in Marine Corps Exchanges, 1988 in civilian retail)