Which wartime innovation did the Army Exchange Service first introduce to boost soldier morale through retail in the 1940s?

The Army & Air Force Exchange Service (AAFES), known to service members as 'The PX' (Post Exchange), has been serving military personnel and their families for generations. These retail establishments have been crucial for morale, providing familiar products and a taste of home to troops stationed around the world. Test your knowledge of this unique military retail institution that has evolved alongside American military history.

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• Mobile PX trucks that could follow troops to forward operating areas
• Catalog shopping with delivery to field positions
• Personalized shopping assistants for officers
• Battlefield vending machines

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