U.S. Air Force Staff Sgt. Stephans Doherty (left) and Senior Airman Nathaniel Awrey, both 447th Expeditionary Aircraft Maintenance Squadron aircraft armament systems journeyman, reassemble an A-10 Thunderbolt II GAU-8/A Avenger rotary cannon April 5, 2017, at Incirlik Air Base, Turkey. The seven barrels are inspected to ensure functionality and are replaced after 30 thousand rounds are fired through them. (U.S. Air Force photo by Airman 1st Class Devin M. Rumbaugh)