Which groundbreaking retail innovation did the Army Exchange Service first introduce to military bases in 1949, years before becoming common 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 and their families worldwide. These military department stores have evolved significantly through wars and peacetime, introducing retail innovations that sometimes predated their civilian counterparts. Test your knowledge about this unique military retail institution that has shaped the lives of millions of service members throughout history.

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

Self-service shopping format (converting from clerk-assisted model)
Standardized pricing across all global locations
Credit card payment systems
Computerized inventory tracking