Pfc. Jacob D. Mays (right), a combat engineer with Company C, 6th Engineer Support Battalion, 4th Marine Logistics Group, Marine Forces Reserve, and Cpl. Sean P. Good (left), a communications corporal with 131 Commando Squadron Royal Engineers, British army, help build a defensive obstacle during exercise Red Dagger at Fort Indiantown Gap, Penn., June 13, 2016. Combat engineers enhance a force’s momentum by physically shaping the battle space to enhance a unit’s use of space and time while denying the enemy unencumbered movement. Exercise Red Dagger is a bilateral training exercise that gives Marines an opportunity to exchange tactics, techniques and procedures as well as build working relationships with their British counterparts. (U.S. Marine Corps photo by Sgt. Ian Leones/Released)