Which innovative retail practice did the U.S. Army Exchange Service first introduce during World War II that later became standard in civilian retail?

The Post Exchange (PX) system has been a cornerstone of military retail for over a century, providing essential goods and services to service members worldwide. These specialized retail environments have evolved significantly through major conflicts and peacetime, with unique branding, merchandising approaches, and cultural significance within military communities. How well do you know the history of this distinctive retail institution that has supported troops from World War I to modern deployments?

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

Self-service shopping format (customers selecting their own merchandise without clerk assistance)
Credit card payment systems for military personnel
Barcode scanning technology for inventory management
Regional distribution centers for centralized supply chain management