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

Military exchanges (PX/BX) have undergone significant transformations throughout history, evolving from basic supply depots to modern retail operations serving military personnel and their families worldwide. These innovations have not only improved quality of life for service members but have also pioneered retail concepts later adopted in civilian markets. Test your knowledge about the history of military retail operations and how they've innovated to serve those who serve.

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

Barcode scanning at checkout (1972)
Self-checkout kiosks (1995)
Contactless payment systems (2002)
Mobile shopping applications (2010)