Which WWII helmet design innovation represented a revolutionary improvement in soldier protection compared to WWI models and influenced military headgear for decades to come?

Throughout military history, certain product designs have revolutionized warfare and saved countless lives. From the simple entrenching tool to advanced fighter aircraft, military equipment design has constantly evolved to meet battlefield demands. This poll tests your knowledge about one of the most significant product design innovations during a major global conflict that fundamentally altered how soldiers engaged in combat. Can you identify the groundbreaking design that transformed military operations?

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The M1 helmet's steel pot design with separate liner system, providing better impact protection and versatility
The German Stahlhelm's extended neck guard, which primarily improved aesthetics rather than ballistic protection
The British Brodie helmet's wider brim design, which excelled at stopping overhead shrapnel but offered minimal side protection
The Soviet SSh-40 helmet's fully enclosed ear coverage, which improved hearing protection but reduced situational awareness