Which retail supply chain innovation fundamentally transformed military PX (Post Exchange) operations during the Vietnam War era?

Post Exchange (PX) stores have been a critical part of military life for generations, providing essential goods and services to service members and their families worldwide. This trivia question explores a significant innovation in military retail that transformed how these stores operate and serve military communities. Test your knowledge about the evolution of military retail infrastructure that has impacted millions of service members.

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Introduction of the SERVMART automated inventory system that used punch cards to track military retail inventory
Implementation of the DODAAC (Department of Defense Activity Address Code) system for centralized supply chain management
Deployment of mobile PX units using converted shipping containers with standardized layouts
Creation of the Military Star Card credit program for contactless purchasing at overseas bases