Marines with Tank Platoon, Company B, Ground Combat Element Integrated Task Force, fire the 120mm main gun of the M1A1 Abrams tank during a live-fire training exercise at Range SR-10, Marine Corps Base Camp Lejeune, North Carolina, Jan. 13, 2015. Marines with Tank Platoon conducted offensive and defensive engagements to prepare for an upcoming assessment at Marine Corps Air Ground Combat Center Twentynine Palms, California. 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)