Which iconic military recruitment marketing campaign of the 20th century resulted in over 40% increase in voluntary enlistments within weeks of its launch?

Throughout history, military forces have engaged in various marketing strategies to boost recruitment, maintain morale, and shape public perception. From ancient Rome's triumphant parades showcasing captured enemies and treasures to modern military recruitment campaigns, the marketing of military service and might has evolved dramatically. This trivia question explores one of the most iconic military marketing campaigns in American history that had a profound impact on recruitment numbers during a critical period.

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Uncle Sam's "I Want YOU" poster campaign during World War I
The "Be All You Can Be" U.S. Army campaign of the 1980s
The "Army of One" recruitment campaign launched in 2001
The "Join the Navy, See the World" campaign of World War II