Lance Cpl. Jessica Justrzebski, a combat engineer,

Lance Cpl. Jessica Justrzebski, a combat engineer, and Lance Cpl. Mitchell Nelson, a heavy equipment operator, both with Marine Wing Support Squadron 373, begin construction on a multi-purpose building for exercise Pacific Horizon 2015 at Camp Pendleton, Calif., Oct. 21. PH15 provides effective and intense training to ensure our forces are capable, interoperable and deployable on short notice. (U.S. Marine Corps photo by Lance Cpl. Caitlin Bevel)