A formation of Americans, Estonians, Swiss, and Ukrainian military stand at the opening ceremony of exercise Clear Sky 2018 Oct. 8, 2018 at Vinnytisa Air Base, Ukraine. Clear Sky was a multi-national exercise aimed to promote peace, security and interoperability between regional allies as well as NATO partners. The two-week exercise brought together nearly 1,000 military personnel from nine countries. (U.S. Air National Guard photo by Master Sgt. Joseph Prouse)
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