Which famous military helmet design was so successful that its manufacturer trademarked its silhouette and actively enforces this trademark against unauthorized commercial uses?

Throughout military history, certain weapons, uniforms, and equipment have become iconic not just for their battlefield performance, but as marketing triumphs. From the Thompson submachine gun's cultural impact to the commercial success of military-inspired clothing lines, war materiel has often crossed into consumer consciousness. Test your knowledge about the commercial side of military history with this challenging question!

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• The M1 'Steel Pot' helmet used by US forces in WWII and Korea
• The German Stahlhelm from World War I and II
• The British Brodie helmet from World War I
• The Swiss M1918/43 helmet still used by the Vatican's Swiss Guard

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