Which wartime souvenir product innovation, developed during World War II, revolutionized military memorabilia retail and became one of the first mass-marketed 'named' battlefield souvenirs?

Throughout military history, soldiers and civilians have collected souvenirs and memorabilia from conflicts. This practice evolved from informal battlefield pickups to a sophisticated retail industry. Today, military museums, specialty shops, and online marketplaces sell everything from reproduction items to authentic artifacts. This poll explores how military retail history has changed over time and the fascinating evolution of war souvenirs as commercial products.

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The 'Blood Chit' identification flags
The 'Zippo' custom engraved lighters
The 'Sweetheart Jewelry' program
The 'Victory Garden' seed kits