Which military retail innovation was first introduced during World War II to boost troop morale and became a permanent fixture of military bases worldwide?

The Post Exchange (PX) and Base Exchange (BX) systems have been crucial to military life for generations, providing essential retail services to service members and their families worldwide. These unique retail operations have evolved significantly over time, adapting to changing military needs while maintaining their core mission. Test your knowledge about this distinctive retail system that has supported troops from World War II to modern deployments.

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Mobile PX trucks that followed frontline units
Self-checkout kiosks at base exchanges
Online ordering systems with base delivery
Duty-free shopping privileges for all service members