Which military retail innovation was first introduced during World War II and revolutionized how deployed soldiers accessed branded products?

Military exchanges (PX/BX) have evolved from basic commissaries to sophisticated retail operations that serve millions of military personnel and their families worldwide. These unique retail environments blend military tradition with modern commerce, offering tax-free shopping and supporting military community programs. How well do you know the history and impact of military retail operations that have shaped service member experiences for generations?

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The Ship's Store Ashore system that created permanent Navy exchanges
The Army Exchange Service's mobile PX trucks that followed combat units
The Air Force's first base department stores with multiple product categories
The Marine Corps Exchange's deployment kits with standardized personal items