Cpl. Joseph A. Childs (right), a team leader with 1st Platoon, Company I, 3rd Battalion, 25th Marine Regiment, 4th Marine Division, Marine Forces Reserve, leads a fire team of Marines and soldiers from the Danish Home Guard through a room clearing drill during exercise Arctic Eagle at Camp Grayling, Mich., April 6, 2016. The Marines joined soldiers with the U.S. Army National Guard and the Danish Home Guard in the bilateral exercise, designed to simulate a joint task force defending key infrastructure in the arctic region. (U.S. Marine Corps photo by Cpl. Ian Leones/Released) - Cpl. Joseph A. Childs (right), a team leader with 1st Platoon, Company I, 3rd Battalion, 25th Marine Regiment, 4th Marine Division, Marine Forces Reserve, leads a fire team of Marines and soldiers from the Danish Home Guard through a room clearing drill during exercise Arctic Eagle at Camp Grayling, Mich., April 6, 2016. The Marines joined soldiers with the U.S. Army National Guard and the Danish Home Guard in the bilateral exercise, designed to simulate a joint task force defending key infrastructure in the arctic region. (U.S. Marine Corps photo by Cpl. Ian Leones/Released)