U.S. Air Force Tech. Sgt. Valarie Platt, 633rd Medical Operations Squadron Neurology Clinic noncommissioned officer in charge, marks the forehead of Airman 1st Class Christopher Howell, 633rd MDOS medical technician, prior to an electroencephalography (EEG) study at U.S. Air Force Hospital Langley at Langley Air Force Base, Va., May 4, 2013. The clinic offers consultations for patients experiencing persistent headaches, numbness or pain, unconsciousness, difficulty walking, moving or balancing, abnormal vocal tone or memory loss. (U.S. Air Force photo by Airman 1st Class R. Alex Durbin/Released)