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A US Army Patriot Missile System participates in the exercise DEFENDER-Europe 21 in Croatia on May 17, 2021. (US Army)
Thomas Moriarty
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A Chinese Navy submarine attends an international fleet review to celebrate the 60th anniversary of the founding of the People's Liberation Army Navy on April 23, 2009 off Qingdao in Shandong Province. (Guang Niu/AFP/Getty Images)
