As the 13th anniversary of the deadliest attack on American soil approaches, many experts warn of the potential threat posed by terrorist networks including Islamic State, or ISIS. ... Unarmed & helpless Americans and Europeans will be viciously ambushed when they least expect it,” he wrote, “and the death toll will be more brutal and widespread than all the peace & love dreamers could ever imagine.” He declared that the somber date of Sept. 11 will be “the day of infamy again.” According to Nugent’s projection, those who already own firearms should “ammo up no matter where you go,” always...