Which military retail innovation was first introduced during World War II and revolutionized how deployed soldiers could purchase products?

The military exchange system has been a cornerstone of service member welfare for generations. These retail operations have evolved from simple commissaries to sophisticated retail networks that generate billions in revenue annually. Beyond providing everyday necessities at tax-free prices, these retail operations help fund critical morale, welfare, and recreation programs for military communities worldwide. How well do you know the history of military retail operations?

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The Ship's Store Ashore program that later became the Navy Exchange
The Mobile Post Exchange (PX) trucks that followed troops to forward positions
The Military Star Card credit system for service members
The Army and Air Force Exchange Service (AAFES) online ordering system