Which iconic military recruitment advertisement from WWI established a personalized advertising technique that's still widely used in modern digital marketing?

The intersection of military history and product marketing has created some fascinating brand strategies and advertising campaigns throughout the decades. Military equipment manufacturers, recruitment campaigns, and even war bonds have all utilized sophisticated marketing techniques. This trivia question explores how one iconic military recruitment campaign revolutionized advertising strategy in the early 20th century.

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Uncle Sam's 'I Want YOU for U.S. Army' poster
Britain's 'Your Country Needs YOU' Lord Kitchener poster
The 'Women of Britain Say GO!' propaganda poster
The 'Daddy, what did YOU do in the Great War?' guilt appeal poster