Portuguese air force F-16s fly over southern Spain, Oct. 23, 2015 as part of Exercise Trident Juncture 2015. Trident Juncture is one of many NATO exercises that provide a venue for current and, potentially, future NATO members to work on war fighting, communication and coordination skills. (U.S. Air Force photo by Senior Airman Christine Halan/Released)
Senior Airman Christine Halan
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