Marines with Tank Platoon, Company B, Ground Combat Element Integrated Task Force, fire their 120mm M1A1 Abrams tank main gun during a Marine Corps Operation Test and Evaluation Activity assessment at Range 500, Marine Corps Air Ground Combat Center Twentynine Palms, California, March 24, 2015. Marines from Tank Platoon completed the MCOTEA assessment, April 13, 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 Sgt. Alicia R. Leaders/Released)