Senior Airman Jordan Cotton, 36th Aircraft Maintenance Unit assistant dedicated crew chief, directs an F-16 Fighting Falcon assigned to the 36th Fighter Squadron to a stop Nov. 4, 2015, at Osan Air Base, Republic of Korea. The Fiends are participating in readiness exercise Vigilant Ace 16. Vigilant Ace 16 is a large-scale exercise designed to enhance combat capabilities and interoperability of the U.S. and Republic of Korea Air Forces. (U.S. Air Force photo/Staff Sgt. Benjamin Sutton)