Which WWII-era product innovation dramatically increased the production and distribution of military insignia, significantly enhancing unit identity and morale among Allied forces?

Throughout military history, insignia, logos, and branding have played crucial roles in unit cohesion, morale, and recognition. From ancient battle standards to modern military logos, these symbols represent more than just identification—they embody values, traditions, and strategic communication. This poll tests your knowledge about a significant product innovation that revolutionized how military insignia were manufactured and distributed during a critical period in modern warfare.

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Plasticized PVC patches, introduced by DuPont in 1943
Heat-sealed embroidered insignia using the Schiffli machine system
Photographic silk-screening process developed by Eastman Kodak
Die-cast metal badges produced through the Lend-Lease program