U.S. Marines and Sailors with the 3rd Battalion, 8th Marine Regiment, 2nd Marine Division, Black Sea Rotational Force 14 execute pushups after completing a battalion 3-mile run around Mihail Kogalniceanu Air Base, Romania, March 7, 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.