More than 100 cyber operators from 21 countries participate in Exercise Crossed Swords 19, at Tallinn, Estonia, on Jan. 31, 2019. The annual exercise, which ran Jan. 28 to Feb. 1, included hands-on, full-scale cyber operations where kinetic and cyber operations were carried out simultaneously, including challenges to industrial control systems, physical security systems, unmanned aerial vehicles and maritime surveillance systems. (Courtesy photo)
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