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.”

Listen to this Column