U.S. Marines came together to join a multinational force during BALTOPS 16, reassuring NATO allies and partner nations the U.S.’s commitment to security and stability in the Baltic Sea.( U.S. Marine Corps photo by Cpl. Lucas Hopkins/Released) - U.S. Marines came together to join a multinational force during BALTOPS 16, reassuring NATO allies and partner nations the U.S.’s commitment to security and stability in the Baltic Sea.( U.S. Marine Corps photo by Cpl. Lucas Hopkins/Released)