Which consumer product became known as 'the fourth necessity of life for our soldiers' through a famous WWI marketing campaign that dramatically increased its military association?

Throughout military history, certain brands have become deeply intertwined with wartime efforts through their marketing strategies, product positioning, and government contracts. These companies leveraged powerful advertising to connect their products with patriotism, military strength, and national identity. This trivia question examines one of the most successful marketing campaigns that transformed an ordinary consumer product into a military icon.

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Coca-Cola
Wrigley's Spearmint Gum
Gillette Razors
Hershey's Chocolate