If he's telling the truth, then the entire history of the last five years needs to be rewritten. His name is Lt. Col. Anthony Shaffer, and he's one of the two military intelligence officers alleging that the Defense Department had located Mohammed Atta and other hijackers in America in 2000. He's now gone public on cable television and in this interview with the New York Times. What's perfectly credible about what Shaffer says is that his unit, Able Danger, developed information about an Al Qaeda cell in Brooklyn and that Pentagon lawyers thrice blocked meetings between his unit and the...