Which military retail innovation, first implemented during WWII, revolutionized how soldiers accessed products and is still used in modern military retail operations worldwide?

The Post Exchange (PX) system has been a crucial part of military life for generations, providing essential goods and morale to troops worldwide. This retail operation has a fascinating history that reflects both military necessity and retail innovation. Test your knowledge about this unique military retail institution that has shaped both military culture and retail practices.

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The mobile PX truck system that brought retail services directly to forward operating bases
The military coupon book system that offered discounts at civilian retailers near bases
The first military credit card system that allowed soldiers to buy now and pay after deployment
The automated vending machine network that operated without human staffing in combat zones