Which iconic military recruitment slogan was first used in World War I and revolutionized brand messaging in military recruitment?

Throughout military history, governments and armed forces have used sophisticated branding and marketing techniques to boost recruitment, maintain morale, and shape public perception. From ancient battle standards to modern recruitment campaigns, military organizations have been pioneers in strategic communication. This trivia question explores how one of history's most famous recruitment campaigns changed military marketing forever.

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"I Want YOU for U.S. Army" (Uncle Sam poster)
"Be All You Can Be"
"The Few. The Proud. The Marines."
"Join, or Die" (Benjamin Franklin's recruitment image)