Which famous military recruitment poster featured a character pointing directly at the viewer, revolutionizing direct marketing techniques that are still studied in marketing courses today?

Throughout military history, marketing and recruitment campaigns have played a crucial role in building armed forces. Some military recruitment slogans and logos have become so iconic that they've influenced civilian marketing strategies and entered popular culture. This trivia question focuses on one of the most successful military recruitment campaigns in history and its marketing innovation that revolutionized how governments appealed to potential recruits.

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Uncle Sam's "I Want YOU for U.S. Army" (USA, 1917)
Lord Kitchener's "Your Country Needs YOU" (UK, 1914)
"Be All You Can Be" campaign poster (USA, 1980)
"Daddy, what did YOU do in the Great War?" poster (UK, 1915)