When former President Donald Trump attacks NATO — as he has done often — it touches a raw nerve in Europe but leaves some Americans puzzled, asking: What is this "NATO," why is it useful, and is the value worth the cost? As someone who has spent most of his adult life in uniform — and working with NATO — let me give some simple, direct answers. NATO is a political alliance, a grouping of democratic states that have learned the hard way — after two devastating wars in Europe and Asia — those nations must band together in peacetime…
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