Approximately 200 U.S. Marines conducted combat enhancement and foreign integration training as part of an exercise in the Baltics, June 6-8, 2016. U.S. Marines integrated with NATO allies and partner nations during BALTOPS 16, building international relationships and combined maritime warfighting capabilities. - Approximately 200 U.S. Marines conducted combat enhancement and foreign integration training as part of an exercise in the Baltics, June 6-8, 2016. U.S. Marines integrated with NATO allies and partner nations during BALTOPS 16, building international relationships and combined maritime warfighting capabilities.