President-elect Barack Obama introduced his principal national-security Cabinet selections to the world Monday and left no doubt that he intends to start his administration on a war footing. Perhaps the least well known among them is retired Marine Gen. James Jones, Obama's pick for national-security adviser. The position is crucial -- think of the power that Henry Kissinger wielded in Richard Nixon's White House. A look into who James Jones is sheds a little light on the Obama campaign's promise of "Change We Can Believe In."

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