WASHINGTON -- When five defendants are brought before a New York federal judge to face charges for the terror attacks of Sept. 11, 2001, the first question may be whether some of them are competent to stand trial at all. Military lawyers for Ramzi Binalshibh, an accused organizer of the 9/11 plot, and Mustafa al-Hawsawi, the conspiracy's alleged paymaster, say their clients have mental disorders that make them unfit for trial, likely caused or exacerbated by years of harsh confinement in Central Intelligence Agency custody. The issue already has arisen in military-commission proceedings at the military's detention facility at Guantanamo...