Marine Corp Lt. Gen. Vincent R. Stewart, Deputy Commander Cyber Command, greets Ukrainian president Petro Poroshenko as he arrives to tour the Clear Sky 2018 exercise at Starokostiantyniv Air Base, Ukraine, Oct. 11, 2018. Exercises like this increase participating nations' capacity to conduct a full spectrum of military operations and strengthen our shared commitment to global security and stability.

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Photo credit: © David Wa / Alamy / Afripics
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