U.S. Marine Corps Lance Cpl. Henry Aybar, motor vehicle operator, Truck Company, Headquarters Battalion (HQBN), 2nd Marine Division (MARDIV), makes an electrolyte drink while watching his post in front of the headquarters company Combat Operations Center (COC) during HQBN's Command Post Exercise (CPX) at gun position 26 on Camp Lejeune, N.C., Sept. 18, 2014. The CPX provides an opportunity for Marines to set up and operate command and control systems to communicate with different elements, in-turn maintaining the battalion's combat readiness. (U.S. Marine Corps photo by Lance Cpl. Kelly L. Timney, 2nd MARDIV, Combat Camera/Released)