A U.S. Marine with 3rd Battalion, 23rd Marine Regiment, instructs Ukrainian marines as they operate their Zodiac boats, July 15, in Shirokyi Lan, Ukraine, during exercise Sea Breeze 2017. Sea Breeze is a U.S. and Ukraine co-hosted multinational maritime exercise held in the Black Sea and is designed to enhance interoperability of participating nations and strengthen maritime security within the region. (U.S. Marine Corps photo by Staff Sgt. Marcin Platek/Released)