180609-N-XT273-2006 BALTIC SEA (June 9, 2018) Thirty maritime unit ships from 12 nations maneuver in close formation for a photo exercise during Exercise Baltic Operations (BALTOPS) 2018 in the Baltic Sea. BALTOPS is the premier annual maritime-focused exercise in the Baltic Region and one of the largest exercises in Northern Europe that is designed to enhance the flexibility and interoperability among allied and partner nations. (U.S. Navy photo by Mass Communication Specialist 1st Class Justin Stumberg/Released)