U.S. Marines with Black Sea Rotational Force 18.1 follow

U.S. Marines with Black Sea Rotational Force 18.1 follow one another in two columns during a six-mile conditioning hike aboard Mihail Kogalniceanu Air Base, Romania, April 27, 2018. Hiking whilst encumbered by a heavy load is an ability Marines require in order to maintain physical fitness and combat readiness. (U.S. Marine Corps photo by Sgt. Victor A. Mancilla)