Which innovative marketing strategy was first used by the United States during World War I that revolutionized military recruitment and became an iconic symbol?

Throughout history, military powers have used various marketing strategies to boost recruitment, maintain morale, and project power. From Ancient Rome's coin propaganda to modern military advertising campaigns, these strategies have evolved dramatically. This trivia question tests your knowledge about a groundbreaking military marketing innovation that transformed recruitment efforts in the early 20th century.

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The 'Uncle Sam Wants YOU' poster campaign featuring a pointing Uncle Sam
The 'Be All You Can Be' television advertising series
The first military-themed video game as a recruitment tool
The 'Join or Die' segmented snake illustration by Benjamin Franklin