U.S. Marines with Mike Battery, 3rd Battalion, 11th Marine Regiment, 1st Marine Division, conduct a fire mission during Steel Knight 2016 (SK-16) at Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Dec 11, 2015. SK-16 is an annual military exercise developed to prepare 1st Marine Division personnel within the Ground Combat Element of a Marine Air-Ground Task Force. (U.S. Marine Corps photo by Lance Cpl Ryan Kierkegaard 1st Marine Division Combat Camera /Released)
