Which retail innovation was first introduced by the US Army to revolutionize how soldiers accessed products during World War II?

The modern military exchange system (PX/BX) represents one of history's most fascinating retail innovations. These stores evolved from simple sutler wagons following troops in the 1800s to sophisticated global retail networks serving military personnel and their families. This poll explores how military retail transformation created a unique shopping ecosystem that balances morale, logistics, and operational security while generating billions in revenue that supports military welfare programs.

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Self-service shopping (allowing soldiers to select their own merchandise rather than requesting it from clerks)
Mobile ordering via field telephones
Automated vending machines at forward operating bases
Catalog shopping with delivery to battlefield positions