U.S. Navy Hospital Corpsman 2nd Class Cory Hopper, center, the assistant leading petty officer with Black Sea Rotational Force 14, shows how to use a tourniquet to personnel with the U.S. Embassy in Bucharest, Romania, Feb. 20, 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.