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A soldier speaks to role players during an exercise at the US Army John F. Kennedy Special Warfare Center and School in April 2019.US Army/K. Kassens
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A competitor descends into the water during the US Army Special Operations Command Best Dive Team Competition in Key West on September 26.US Army/K. Kassens
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Russian soldiers during the Vostok military exercise at a training area south of Vladivostok in September 2018.MLADEN ANTONOV/AFP via Getty Images