Staff Sgt. Christopher Alteri, 36th Aircraft Maintenance Unit weapons load crew team chief, performs a weapons inspection on an F-16 Fighting Falcon assigned to the 36th Fighter Squadron Nov. 4, 2015, at Osan Air Base, Republic of Korea. The 36th FS is participating in 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)