U.S. Marines and Sailors with Golf Company, 2nd Battalion, 2nd Marine Regiment, assigned to Black Sea Rotational Force (BSRF) 14-2A, adjust the optics on M4 carbines Aug. 27, 2014, at a range near Mihail Kogalniceanu Air Base, Romania. The company fired M16A4 rifles, M4 carbines and M249 light machine guns. BSRF 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.