Corporal John Graham, a gunner with 3rd Low Altitude Air Defense Battalion, Marine Air Control Group 38, 3rd Marine Aircraft Wing, prepares a dummy FIM-92 anti-aircraft weapon during a convoy air-defense exercise aboard Marine Corps Base Camp Pendleton, Calif., Aug. 25, 2015. The exercise gave the Marines the opportunity to work with a simulated enemy aircraft, an AH-1Z Cobra helicopter provided by Marine Light Attack Helicopter Squadron 169, Marine Aircraft Group 39, 3rd MAW. Realistic training allows Marines to remain effective in increasingly complex environments around the world. (U.S. Marine Corps photo by Lance Cpl. Caitlin Bevel)