U.S. Marines with 6th Engineer Support Battalion, 4th Marine Logistics Group, and British commando’s with 131 Commando Squadron Royal Engineers, British Army, practice clearing a building at the military operations on urbanized terrain, or MOUT structure, during exercise Red Dagger at Fort Indiantown Gap, Pa., May 16, 2018. 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. Melanie Wolf/Released)