While no one yet knows what ignited Major Nidal Malik Hasan's murderous rage Thursday afternoon, Nov. 5, at Fort Hood, the kindling was hiding in plain sight. The Army had ordered Hasan, wrestling with the conflicting demands of being a soldier, a psychiatrist and a Muslim, to the post with the highest toll of Army suicides. Fort Hood is one of the Army's most stressed posts because of its units' revolving-door deployments to Afghanistan and Iraq. Finally, the Army made clear that Hasan couldn't escape his own pending deployment to Afghanistan, where he'd have to salve the mental wounds of...