U.S. Marines with 10th Marine Regiment, 2nd Marine Division, communicate with units during the Command Post Exercise (CPX) within their Command Operating Center at Camp Lejeune, N.C., March 6, 2014. The CPX is designed to strengthen the unit's combat effectiveness for future operations. (U.S. Marine Corps photo by Lance Cpl. Hannah Schuller, 2nd MARDIV, Combat Camera/Released)