Brig. Gen. Terryl Schwalier was stunned when he read the account of the June 25, 1996 Khobar Towers bombing in Saudi Arabia that appeared in my recent book, Countdown to Crisis: the Coming Nuclear Showdown with Iran. I was writing many years after the fact, drawing on sources from inside Iranian intelligence but also on published U.S. government reports. It was those U.S. reports that prompted General Schwalier to contact me a few months ago. “You paint a picture of significant government awareness that “Iran was up to something” in the months prior to the Khobar Towers attack,” he wrote...