Which retail innovation during World War II fundamentally changed how U.S. soldiers purchased personal items, creating a retail model still used in military bases today?

Throughout military history, retail innovations have dramatically changed how equipment and supplies reach armed forces. From traditional procurement systems to modern military supply chains, retail evolution has impacted military readiness and effectiveness. This trivia question explores a pivotal moment in military retail history that changed how soldiers accessed their equipment and influenced modern military retail operations.

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The Post Exchange (PX) system
Military catalog ordering
Mobile commissary trucks
Victory Bonds retail kiosks