Which wartime packaging innovation for military medals was first widely implemented during World War II and fundamentally changed how decorations were preserved?

Military insignia and medals have a fascinating history of packaging design that evolved significantly over the centuries. From simple cloth wrappings to elaborate presentation cases, the way nations package their military honors reflects both practical considerations and symbolic importance. This trivia question explores a pivotal innovation in military medal packaging design that revolutionized how these prestigious symbols were preserved and presented to recipients.

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Vacuum-sealed plastic encasements that prevented oxidation of metal medals
Clear acrylic display cases with ultraviolet protection
Silk-lined wooden presentation boxes with regiment insignias
Leather pouches with individual compartments for medal components