A 633rd Surgical Operations Squadron anesthesiologist monitors a patient's vitals during a cataract extraction surgery at U.S. Air Force Hospital Langley at Langley Air Force Base, Va., Dec. 17, 2013. The clinic provides specialized care by surgeons trained at premier medical schools throughout the country who stand ready to offer a wide range of surgical services at any time, day or night. (U.S. Air Force photo by Airman 1st Class R. Alex Durbin/Released)