U.S. Marines with the Combined Arms Company, Black Sea Rotational Force familiarize Bulgarian Soldiers with the M-777 Howitzer artillery cannon during Platinum Lion 16-2 at Novo Selo Training Area, Bulgaria, Jan. 7, 2016. Exercise Platinum Lion increases readiness and demonstrates our collective ability to operate as a single force committed to protecting the sovereignty of NATO allies and other European partners. (U.S. Marine Corps Photo by Cpl. Justin T. Updegraff/ Released)