Marines with Battery A, Ground Combat Element Integrated Task Force fire a M795 High Explosive projectile during a fire mission as part of the Marine Corps Operational Test and Evaluation Activity assessment at Gun Position Quackenbush, Marine Corps Air Ground Combat Center Twentynine Palms, California, March 4, 2015. From October 2014 to July 2015, the GCEITF will conduct individual and collective level skills training in designated ground combat arms occupational specialties in order to facilitate the standards-based assessment of the physical performance of Marines in a simulated operating environment performing specific ground combat arms tasks. (U.S. Marine Corps photo by Lance Cpl. Manuel R. Benavides/Released)