Which famous military recruitment poster from WWI employed psychological techniques that revolutionized government marketing?

Throughout military history, governments and armed forces have employed sophisticated marketing strategies to boost recruitment, maintain morale, and shape public perception of conflicts. From ancient Roman military symbolism to modern recruitment campaigns, these strategies have evolved dramatically while maintaining certain psychological principles. Test your knowledge about the intersection of military history and marketing psychology!

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Uncle Sam's 'I Want YOU for U.S. Army' poster, which used direct address and eye contact to create personal obligation
Britain's 'Keep Calm and Carry On' poster, which used simple messaging to maintain civilian morale
The Soviet 'Motherland Calls' poster, which used familial obligation as its primary psychological trigger
Germany's 'Loose Lips Sink Ships' campaign, which employed fear tactics to ensure operational security