Which retail innovation, first widely implemented by the U.S. Army during World War II, revolutionized military logistics and later became a standard practice in civilian retail?

Military exchanges and post exchanges (PX) have a fascinating history in retail logistics and product development. These military retail operations have evolved from simple sutlers' tents during the American Civil War to sophisticated global retail networks serving military personnel worldwide. This trivia question explores a pivotal moment in military retail history that revolutionized how products were developed and delivered to troops in the field.

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K-Rations in standardized packaging
Containerization of retail goods
Mobile PX trucks with refrigeration
Automated inventory control systems