Infantry Skills A Marine engages simulated enemy combatants during a combined arms exercise at Camp Lejeune, N.C., Dec. 15, 2017. The Marine is assigned to Delta Company, Infantry Training Battalion, School of Infantry East. The battalion's mission is to train Marines in basic infantry skills before integrating them into operational forces. Marine Corps photo by Cpl. Manuel A. Serrano SHARE: Download: Full Size (0.61 MB) Credit: Cpl. Manuel Serrano VIRIN: 171215-M-SH393-226C.JPG Photo Gallery