Which famous product, marketed with the slogan 'The first personal protection against gas attacks,' became a critical military item after the Second Battle of Ypres in 1915?

Throughout military history, certain products and innovations have revolutionized the way wars were fought. From ancient weapons to modern military technology, these products represent turning points in battlefield tactics and strategy. This trivia question focuses on a famous product that had a profound impact on World War I and altered military history. Test your knowledge of military product history and the innovations that shaped warfare forever.

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Brodie Helmet (British 'Tin Hat')
Small Box Respirator gas mask
Mills Bomb hand grenade
Webley Mk VI service revolver