Which military retail innovation was first introduced during World War II and revolutionized how soldiers accessed everyday products in combat zones?

Military exchanges (PX/BX/NEX) have been crucial to troop morale and welfare for centuries. These unique retail operations serve military communities worldwide, offering tax-free shopping and generating billions in revenue that funds morale, welfare, and recreation programs. This poll tests your knowledge about these distinctive retail operations that have played a significant role in military history and continue to support service members and their families today.

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The Mobile PX (Post Exchange) truck system that brought retail goods directly to forward operating areas
The Military Scrip System that eliminated the need for soldiers to carry national currencies in foreign theaters
The Battlefield Commissary Network that allowed families to send personalized care packages to specific deployment locations
The Radio Catalog Service where soldiers could order items via military radio frequencies for next-convoy delivery