Marines disembark a CH-53E Super Stallion to prepare a M777 Howitzer for firing during a reactionary combat training exercise aboard Marine Corps Base Camp Lejeune, N.C., Sept. 30, 2014. The combined air-ground team used the training to build cohesion and improve their ability to rapidly deploy the weapon system in a combat environment. (U.S. Marine Corps photo by Lance Cpl. Olivia C. McDonald/Released)