A Portuguese air force F-16 takes fuel from a KC-135 Stratotanker from the 100th Air Refueling Wing, Oct. 23, 2015, over southern Spain. Both aircraft are participating in Exercise Trident Juncture 2015, which consists of combined training and security cooperation efforts enabling allies and partners to respond more effectively to regional crises, improve the security of borders, ensure energy security, and counter threats. (U.S. Air Force photo by Senior Airman Christine Halan/Released)