Which famous military helmet design was marketed so successfully during WWII that its manufacturer saw civilian sales skyrocket after the war, becoming a household product still used today?

Throughout history, military equipment manufacturers have created some of the most iconic product designs and marketing campaigns. These companies have had to balance functionality, durability, and appeal to government procurement officials while creating brand recognition. This trivia question explores how one famous military product design became a cultural phenomenon through innovative marketing that transcended its original purpose.

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The M1 helmet design by McCord Radiator, which later became the foundation for construction hard hats
The Brodie helmet by Brodie Munitions, which later transformed into the modern bicycle helmet
The Stahlhelm by Eisenhüttenwerke, which became the basis for motorcycle helmets in the 1950s
The Adrian helmet by Manufacture d'Armes de Saint-Étienne, which evolved into the classic chef's hat design