A U.S. Air Force HC-130 Combat King II cargo aircraft sits on Osan Air Base, South Korea, during the loading of simulated aeromedical evacuation patients, Nov. 5, 2015. The aircraft crew, assigned to the Alaska National Guard’s 144th Airlift Squadron, is participating in Vigilant Ace 16, a large-scale exercise designed to enhance combat capabilities and interoperability between the U.S. and South Korea air forces. U.S. Air Force photo by Staff Sgt. Benjamin Sutton