Which retail innovation transformed the military shopping experience during World War II, becoming the foundation for the modern Army & Air Force Exchange Service (AAFES) system?

Throughout history, military exchanges and commissaries have played a crucial role in troop morale and readiness. From frontier outposts to modern PX facilities, the retail experience for service members has transformed dramatically. This poll explores how military retail operations have evolved to meet the changing needs of armed forces personnel and their families, highlighting a significant retail transformation that occurred during a pivotal period in military history.

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The Post Exchange (PX) mobile trailer system that followed troops to frontlines
Self-service commissaries replacing clerk-assisted shopping in military bases
Introduction of military scrip currency for exclusive use in on-base retail
Mail-order catalog system allowing soldiers to shop from deployment locations