U.S. Air Force Senior Airman Samantha Sickler, 633rd Medical Operations Squadron gastroenterology technician, cleans a laparoscopic camera used in gastroenterological procedures, Jan. 23, 2013, at U.S. Air Force Hospital Langley, Langley Air Force Base, Va. Gastroenterology is the branch of medicine focused on the digestive system and diseases affecting the gastrointestinal tract. (U.S. Air Force photo by Airman 1st Class R. Alex Durbin/Released)