Which military retail innovation was first introduced during WWII and revolutionized how products were distributed to frontline troops?

The military exchange system has a fascinating retail history that has evolved significantly over centuries. Post Exchanges (PX) and Navy Exchanges (NEX) represent one of the oldest and most unique retail systems in America, designed specifically for service members and their families. These retail operations have pioneered innovations in supply chain management, global distribution, and customer loyalty programs that later influenced civilian retail. Test your knowledge about this specialized retail sector that serves those who serve!

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The K-Ration merchandising system
Mobile Post Exchange (PX) trucks
Catalog ordering for deployed personnel
Military scrip currency for retail purchases