Over half of Gulf War veterans receive compensation for service-connected disabilities, with rates far exceeding those of previous wars. Traumatic brain injury (TBI) is a signature injury of recent wars, with IED explosions accounting for 65% of combat injuries and an estimated 10,000 service members having experienced TBI. Common symptoms reported in veterans with suspected TBI include sleep disturbances, irritability, attention/concentration problems, mood swings, memory problems, anxiety, headaches, light/noise sensitivity, depression, and visual disturbances.