Which of these famous military recruitment slogans led to the highest measurable increase in enlistment numbers when it was first introduced?

Throughout history, military recruitment campaigns have produced some of the most memorable and effective marketing taglines ever created. These slogans not only boosted enlistment but also became embedded in our cultural consciousness. This trivia challenge tests your knowledge of famous military recruitment slogans that transformed how armed forces marketed themselves to potential recruits. Can you identify which historic recruitment slogan had the most significant impact on enlistment numbers during its peak usage?

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"Be All You Can Be" (U.S. Army, 1980)
"The Few. The Proud. The Marines." (U.S. Marines, 1977)
"Uncle Sam Wants You" (U.S. Army, WWI)
"Your Country Needs You" (British Army, WWI)