A Marine with 2nd Battalion, 10th Marine Regiment participating in Reconnaissance Selection Occupation and Position training, uses an aiming circle during a section chief’s course aboard Camp Lejeune, N.C., Aug. 6, 2015. The aiming circles orient the mortar, making sure the mortar will accurately provide supporting fire. The Marines undergoing section chief’s course will potentially be in charge of a team of five Marines and an artillery weapon system once returning to the unit. (U.S. Marine Corps photo by Lance Cpl. Chris Garcia/Released) - A Marine with 2nd Battalion, 10th Marine Regiment participating in Reconnaissance Selection Occupation and Position training, uses an aiming circle during a section chief’s course aboard Camp Lejeune, N.C., Aug. 6, 2015. The aiming circles orient the mortar, making sure the mortar will accurately provide supporting fire. The Marines undergoing section chief’s course will potentially be in charge of a team of five Marines and an artillery weapon system once returning to the unit. (U.S. Marine Corps photo by Lance Cpl. Chris Garcia/Released)