Neurologist Maj. (Dr.) Maria Alvarez, 59th Medical Operations Squadron, injects Robert O'Reilly with botulinum toxin Sept. 9 at Wilford Hall Medical Center, Lackland Air Force Base, Texas. Dr. Alvarez is leading a case study to improve treatment of traumatic brain injury patients with chronic headaches. (U.S. Air Force photo/Senior Airman Amber Bressler)