U.S. Marine Corps Lance Cpl. Obasi Dukuzumuremyi, a combat engineer with Marine Rotational Force Darwin, provides security during sweep routines at Koumac, New Caledonia, May 20, 2018. Sweeps are typically conducted to search for materials in the ground that may be used against friendly forces or be of intelligence value. Their capabilities are both constructive, e.g., building bunkers, providing utilities and destructive, e.g., demolition and breaching support capabilities to the battlefield. This unique combination of capabilities provides knowledge, experience and skills to commanders at the operational and tactical levels with which they can, according to Marine Corps Warfighting Publication 3-34 reduce friction, facilitate maneuver and improve the morale of friendly forces or create friction and disorder for the enemy. (U.S. Marine Corps photo by Cpl. Mason Roy)