Which groundbreaking retail innovation did the U.S. military introduce during World War II that revolutionized how deployed soldiers could purchase personal items?

The Post Exchange (PX) and Base Exchange (BX) systems represent one of the most successful retail innovations in military history. These stores have provided essential goods and services to military personnel and their families around the world, often in remote or hostile environments. This poll tests your knowledge about this unique retail system that has shaped military life for generations.

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Mobile PX trucks that followed combat units to provide retail services at the front lines
Catalog ordering system with air-dropped deliveries for soldiers in combat zones
Centralized scrip system replacing cash transactions in all overseas military stores
Self-service store model eliminating sales clerks in all military exchanges