F-16 rests as hardened aircraft shelter door closes for night

An F-16 Fighting Falcon rests as the hardened aircraft shelter closes its door for the night during exercise Vigilant Ace 16 at Osan Air Base, Republic of Korea, Nov. 4, 2015. The F-16s at Osan are part of the 36th Fighter Squadron ???Fiends??? whose mission is to conduct air interdiction, close air support and counter-air missions in day and night conditions. Exercise Vigilant Ace 16 is a peninsula-wide readiness exercise focused on strengthening the ROK and U.S. alliance.  (U.S. Air Force photo/Tech. Sgt. Travis Edwards)

An F-16 Fighting Falcon rests as the hardened aircraft shelter closes its door for the night during exercise Vigilant Ace 16 at Osan Air Base, Republic of Korea, Nov. 4, 2015. The F-16s at Osan are part of the 36th Fighter Squadron ???Fiends??? whose mission is to conduct air interdiction, close air support and counter-air missions in day and night conditions. Exercise Vigilant Ace 16 is a peninsula-wide readiness exercise focused on strengthening the ROK and U.S. alliance. (U.S. Air Force photo/Tech. Sgt. Travis Edwards)