Cpl. Jacob Lebo, a rifleman with 1st Platoon, Bravo

Cpl. Jacob Lebo, a rifleman with 1st Platoon, Bravo Company, 2nd Law Enforcement Battalion, mans the main security post built using more than 600 sandbags with his .50 caliber machine gun during the II Marine Expeditionary Force Command Post Exercise 3 at Camp Lejeune, N.C., April 20, 2016. During the CPX, 2nd LEB posted security around the campsite and defended it from mock enemies, ensuring the headquarters element could complete the mission safely. (U.S. Marine Corps photo illustration by Cpl. Michelle Reif/Released)