Which iconic military advertising campaign was first launched during World War I and is considered one of the most successful recruitment marketing strategies in military history?

Throughout history, military organizations have developed sophisticated marketing strategies to boost recruitment, maintain morale, and build public support. From ancient Rome's eagle standards to modern military promotional campaigns, the branding and marketing of military service has evolved significantly. This trivia question focuses on an innovative advertising technique that revolutionized military recruitment during a critical period in American history.

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The "I Want YOU for U.S. Army" Uncle Sam poster campaign
The "Be All You Can Be" U.S. Army slogan campaign
The "Few Good Men" Marine Corps recruitment campaign
The "Duty Calls" Liberty Bonds poster series