Which revolutionary retail innovation was first widely implemented in military exchanges (PX/BX) during WWII before becoming standard in civilian stores?

Military exchanges (PX/BX) have been crucial retail environments for servicemembers for centuries. These specialized retail operations have evolved from simple sutler wagons following troops to modern department-store-like facilities and online platforms. They've introduced unique packaging, marketing strategies, and retail innovations specifically designed for military consumers while operating in some of the world's most challenging retail environments. Test your knowledge of this specialized retail segment that directly impacts military morale and readiness!

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Self-service shopping with shopping carts
Mail-order catalogs with international delivery
Branded product packaging with nutrition information
Price scanners and electronic checkout systems