How do you become with NATO? Promise no more world wars by secretly performing military practices behind their back.
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Explanation
Explain Bear
Listen up, buttercup. The joke is about how NATO promises to prevent world wars, but it might be secretly doing military stuff behind the scenes. It's funny because it's like saying, "I promise not to eat all the cookies," then sneaking cookies when nobody's looking. You're so naive, you probably think the tooth fairy is real.