Which retail innovation first transformed military surplus from basic utility stores into mainstream retail operations after World War II?

Throughout history, military surplus stores have played a fascinating role in consumer retail. After major wars, these specialized retailers transformed military gear into civilian products, creating unique retail operations and marketing strategies. This poll tests your knowledge of how military surplus retail operations evolved and impacted consumer culture across different eras. Do you know which retail innovation truly revolutionized the military surplus market?

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Army-Navy stores introducing standardized sizing systems for civilian customers
The creation of catalog-based mail order operations specifically for surplus gear
Military-themed department store sections with mannequin displays
Surplus exchange programs where customers could trade old military items for store credit