An AH-64 Apache helicopter takes part in Exercise Trident Juncture 2015, NATO's largest joint and combined military exercise in more than a decade, at the San Gregorio training grounds outside Zaragoza, Spain, November 4, 2015. Some 36.000 personnel from more than 35 nations, including all NATO Allies will have participated in Exercise Trident Juncture 2015 which began on 21 October, in Italy, Portugal and Spain, including their adjacent waters and airspace and runs till November 6. (Photo by Paul Hanna/Reuters)
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