CAMP GRAYLING, Mich. – U.S. Marines from Echo Company, 4th Reconnaissance Battalion, 4th Marine Division, Marines Forces Reserve, check their gear after conducting a helocast exercise into Lake Margrethe at Camp Grayling Joint Maneuver Training Center, Michigan, during exercise Northern Strike 2017, July 31, 2017. Northern Strike 17 prepares Marines from across 4th Marine Division as they prepare for Integrated Training Exercise 2018 and future mobilizations and deployments. (U.S. Marine Corps photo by Lance Cpl. Niles Lee/Released) - CAMP GRAYLING, Mich. – U.S. Marines from Echo Company, 4th Reconnaissance Battalion, 4th Marine Division, Marines Forces Reserve, check their gear after conducting a helocast exercise into Lake Margrethe at Camp Grayling Joint Maneuver Training Center, Michigan, during exercise Northern Strike 2017, July 31, 2017. Northern Strike 17 prepares Marines from across 4th Marine Division as they prepare for Integrated Training Exercise 2018 and future mobilizations and deployments. (U.S. Marine Corps photo by Lance Cpl. Niles Lee/Released)