Marines with Battery Q, 5th Battalion, 14th Marine Regiment, 4th Marine Division, Marine Forces Reserve, fire a M777A2 Howitzer during their annual training exercise aboard Marine Corps Base Camp Pendleton, Calif., July 16, 2016. Annual training exercises ensures that Reserve Marines are trained and prepared for any future operation or contingency. (U.S. Marine Corps photo by Cpl. Gabrielle Quire/Released)