A U.S. Marine with Black Sea Rotational Force 14 plots grid locations on a map in preparation for a unit-wide squad competition that incorporates both academic and physical challenges at Mihail Kogalniceanu Air Base, Romania, Jan. 9, 2014. Black Sea Rotational Force is an annual multilateral security cooperation activity between the U.S. Marine Corps and partner nations in the Black Sea, Balkan and Caucasus regions designed to enhance participants collective professional military capacity, promote regional stability and build enduring relationships with partner nations.