U.S. Marine Corps Lance Cpl. James A. Allday, motor transportation mechanic, 6th Marine Regiment, 2nd Marine Division (MARDIV), prepares to conduct a battle sight zero of an M240 medium machine gun at Marine Corps Air Ground Combat Center Twentynine Palms, Calif., April 30, 2015. 6th Marines and subordinate units participated in Intergrated Training Exercise 3-15 to ensure all elements of Special-Purpose Marine Air Ground Task Force 6 are prepared for upcoming deployments and operational commitments. (U.S. Marine Corps photo by Staff Sgt. Keonaona C. Paulo 2D MARDIV Combat Camera/Released)