Marines with 2nd Combat Engineer Battalion post security during the assault breacher’s portion of the Sapper leader’s course at Camp Lejeune, N.C., Jan. 28, 2016. The three-week long course trains the Marines to be more proficient at patrolling, demolitions and demolition breaching. (U.S. Marine Corps photo by Cpl. Joey Mendez) - Marines with 2nd Combat Engineer Battalion post security during the assault breacher’s portion of the Sapper leader’s course at Camp Lejeune, N.C., Jan. 28, 2016. The three-week long course trains the Marines to be more proficient at patrolling, demolitions and demolition breaching. (U.S. Marine Corps photo by Cpl. Joey Mendez)