Which innovative customer loyalty program was first introduced in military Post Exchanges (PX) during WWII that later influenced civilian retail?

The Post Exchange (PX) system represents one of history's most successful military retail operations. These stores have served troops worldwide for over a century, evolving from simple sutlers' wagons to sophisticated retail networks. Beyond providing everyday necessities, PXs boost morale, create familiar environments in foreign deployments, and generate revenue that supports military welfare programs. Test your knowledge about this unique customer loyalty program that has shaped military retail history!

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The Star Card credit system that allowed service members to make purchases with delayed payment
Tax-exempt purchasing that eliminated sales tax for all military personnel
The dividend point system that awarded cash rebates based on purchase volume
Military-exclusive branded products that were only available to service members