A door blows open by the force of a detonated charge during an exercise in Skrunda, Latvia on June 13, 2018. Attacking Forces comprised of U.S. Marines, United Kingdom Royal Marines, Michigan Army National Guard, and Norwegian Forces during a battle simulation for Saber Strike. Saber Strike 18 is the eighth iteration of the long-standing U.S. Army Europe-led cooperative training exercise enhancing interoperability among allies and regional partners. (U.S. Air Force photo by Staff Sgt. Jimmie D. Pike)