Which wartime innovation in military retail was first widely implemented during World War II, forever changing how soldiers shopped while deployed?

The Post Exchange (PX) system has been a vital part of military life for generations, providing essential goods and services to service members and their families worldwide. This retail network has evolved significantly through conflicts and peacetime, becoming a unique retail institution with its own history, traditions, and innovations. Test your knowledge about this special retail system that has supported troops from World War I to modern deployments.

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Ship's Service stores on naval vessels
Mobile PX units that followed troops to the front lines
Commissary credit card system
Military-exclusive brand partnerships