Which retail product innovation first successfully mass-marketed authentic military history to civilians after World War II, creating a billion-dollar collectibles industry?

Throughout history, retail innovations have shaped how military history is preserved and commemorated. From battlefield relics to mass-produced souvenirs, the military memorabilia market has evolved dramatically. This poll tests your knowledge about a pivotal product development that revolutionized how military history was marketed to the public and transformed from niche collectors' items to mainstream retail success. Can you identify which product innovation truly changed the landscape of military history retail?

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G.I. Joe action figures (Hasbro, 1964) - the first military-themed toys with interchangeable authentic uniforms and equipment
Military Trading Cards by Topps (1950s) - featuring authentic war imagery and statistics on weapons and battles
Surplus Conversion Kits (1946-1952) - allowing civilians to purchase and repurpose authentic military gear for everyday use
Battlefield Tour Guides (1947) - commercially published books with maps allowing self-guided tours of famous battle sites