Which innovative retail strategy did the U.S. Army implement for soldiers during World War II that revolutionized military consumer product distribution and later influenced civilian retail?

Post Exchanges (PX) and Base Exchanges (BX) have been crucial retail operations supporting military personnel for generations. These specialized retail chains have evolved significantly since their inception, developing unique consumer products and shopping experiences tailored to servicemembers and their families. This trivia question explores an interesting aspect of military retail history that shaped soldier consumer habits during a critical period.

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The PX Ration Card System, which allocated luxury goods based on rank and service duration
The Army Exchange Service's mobile PX trucks that followed combat units to provide essential supplies and comfort items
The Victory Mall program, creating temporary department stores in liberated European cities
The Tactical Retail Deployment system, using submarines to deliver products to Pacific island bases