Two F-16 fighter aircraft fly over the Beja Air Base, Portugal, flightline Oct. 21, 2015. Several F-16 Fighting Falcon fighter aircraft, pilots and support personnel assigned to the 52nd Fighter Wing, Spangdahlem Air Base, Germany, are here to participate in Exercise Trident Juncture 2015, a multiservice, multinational exercise geared toward demonstrating NATOs ability to respond on a large scale to a crisis scenario. (U.S. Air Force photo by Airman 1st Class Luke Kitterman/Released)