A U.S. Air Force F-15 Eagle assigned to the 44th Fighter Squadron, Kadena Air Base, Japan, takes off during Exercise Valiant Shield at Andersen Andersen AFB, Guam, Sept. 14, 2016. Valiant Shield is a biennial U.S. Air Force, Navy and Marine Corps exercise held in Guam, focusing on real-world proficiency in sustaining joint forces at sea, in the air, on land and in cyberspace. (U.S. Air Force photo by Tech. Sgt. Richard P. Ebensberger)