F-16 and KF-16 Fighting Falcon pilots from the U.S. Air Force 35th Fighter Squadron and Republic of Korea Air Force 123rd Tactical Fighter Squadron gather together during Exercise Buddy Wing 15-4 at Kunsan Air Base, ROK, June 4, 2015. Buddy Wing exercises are held multiple times throughout the year at various U.S. and ROKAF bases to sharpen combined air combat tactics on the peninsula. (U.S. Air Force photo by Staff Sgt. Nick Wilson/Released)