Which innovative retail payment system was FIRST introduced at Army Post Exchanges (PX) during World War II that revolutionized how military personnel shopped?

The Post Exchange (PX) system is one of the oldest and most influential retail operations in military history. Established to provide essential goods to service members and their families at reasonable prices, this retail innovation has evolved over centuries to become a cornerstone of military life. Test your knowledge about this unique retail operation that has shaped military commerce and culture worldwide.

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Military Payment Certificates (MPCs)
Eagle Cash Cards
Star Card credit system
Direct payroll deduction system