Two senior Army analysts who in 2003 accurately foretold the turmoil that would be unleashed by the U.S. invasion of Iraq offer a bleak assessment in a new study of what now lies ahead in that bloodied land. They advise, however, against setting a timetable for U.S. troop withdrawal - unless Washington finds the situation "irredeemable." A timetable "is an excuse for allowing the system to collapse," the Army War College's W. Andrew Terrill and Conrad C. Crane write. Political pressure is building in Washington for a concrete plan to extricate U.S. forces from Iraq. On Tuesday, on the eve...