Which retail innovation was first introduced by the U.S. Army Exchange Service during WWII that revolutionized how troops accessed consumer goods in combat zones?

Military Post Exchanges (PX) and Base Exchanges (BX) have been vital retail institutions for armed forces personnel for over a century. These specialized retail operations provide tax-free shopping and familiar products to military members deployed worldwide, becoming an important element of military logistics and morale. This poll explores how military retail operations have evolved and innovated to support troops throughout modern warfare history.

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Mobile PX trucks that followed front-line units to provide basic necessities and comfort items
Catalog order system allowing troops to order American products for delivery to their overseas locations
Standardized pricing policy ensuring all soldiers paid the same price regardless of deployment location
Scrip currency system replacing cash transactions in forward operating bases