A Ukrainian soldier of 1st/30th Mechanized Infantry Battalion engages the opposing forces while conducting a field training exercise during Exercise Rapid Trident 17 at the International Peacekeeping Security Centre in Yavoriv, Ukraine Sept. 19, 2017. Rapid Trident 17 will provide participating nations with the opportunity to improve theatre security cooperation within Eastern Europe, enhance interoperability amongst NATO members and partners, and to combine capabilities to operate joint, multinational and integrated security operations. (U.S. Army photo by Pfc. Zachery Perkins)