Which product design innovation, first widely deployed during World War I, fundamentally changed infantry tactics and battlefield movement patterns?

Throughout military history, product design innovations have transformed warfare capabilities. From ancient shields to modern stealth technology, the evolution of military equipment showcases how design thinking addresses battlefield challenges. This trivia tests your knowledge about a significant product design breakthrough that changed military strategy forever. Do you know which famous military product design innovation caused commanders to completely rethink their tactical approach?

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The M1917 Enfield rifle, which introduced standardized manufacturing techniques for mass deployment
The tank, which combined armor protection, firepower, and mobility in a single platform
Machine guns with belt-fed ammunition systems, allowing sustained fire from fixed positions
Steel helmets, which reduced casualty rates from artillery shell fragments by over 30%