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©SIESE VEENSTRA/EPA/MAXPPP - epa07478270 Aircraft spotters using their cameras and telephoto lens are silhouetted during the international exercise 'Frisian Flag 2019' at Leeuwarden Airbase, The Netherlands, 01 April 2019. Military aircraft from Germany, France, Poland, Switzerland and the USA will take part in the international exercise which will run till 12 April 2019. EPA-EFE/SIESE VEENSTRA