Which retail innovation, created for U.S. military personnel during WWII, revolutionized product distribution to troops and later influenced civilian retail strategies?

During World War II, military personnel stationed abroad faced challenges accessing basic necessities and comfort items. This led to one of the most significant innovations in military retail history - a system that would later influence civilian retail strategies worldwide. This innovation fundamentally changed how products were distributed to troops and established retail principles still used in modern military exchanges and civilian retail operations.

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Post Exchange (PX) system with standardized pricing
Mobile Commissary Units (MCUs) with rotating inventory
Victory Stores with point-based rationing
Allied Commerce Centers with international products