U.S. Air Force Senior Airman Dalia Mireles, 633rd Medical Group medical technician, prepares lung tissue samples after a bronchoscopy Feb. 12, 2013, at U.S. Air Force Hospital Langley, Va. The sample was sent to the hospital lab to determine if the patient had healthy lungs. (U.S. Air Force photo by Airman 1st Class Austin Harvill/Released)