Army Reserves Improves Tank Firing Range in Bulgaria
841st Engineer Battalion, U.S. Army reserve, Operation Resolute Castle, 2nd July 2016 conducts roadway work using articulated concrete block (ACB) matte which are concrete blocks connected by rope-like cables which allows each individual block to be flexible to conform to the terrain. (U.S. Army photo by Spc. Luis Ballester, 841st Engineer Battalion, United States Army Reserve)