Which product design innovation of the 1940s revolutionized military equipment merchandising and later became a retail standard for identifying genuine military surplus items?

Throughout history, military organizations have developed innovative methods for product design and merchandising of military equipment and memorabilia. From ancient armor workshops to modern military surplus stores, the marketing and retail of military goods has evolved dramatically. This poll tests your knowledge about a groundbreaking product design innovation that changed how military equipment was marketed and sold to both armed forces and civilian collectors.

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The P-38 can opener included with K-rations
The NATO Stock Number (NSN) cataloging system
The standardized contract tag system with federal stock numbers
Vacuum-sealed packaging for long-term equipment storage