Sgt. Dustin Houghton, mortar man, with Ground Combat Element Integrated Task Force, secures an M252 81mm medium-weight mortar during a Marine Corps Operational Test and Evaluation Activity assessment at Range 107, Marine Corps Air Ground Combat Center Twentynine Palms, California, April 24, 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. - Sgt. Dustin Houghton, mortar man, with Ground Combat Element Integrated Task Force, secures an M252 81mm medium-weight mortar during a Marine Corps Operational Test and Evaluation Activity assessment at Range 107, Marine Corps Air Ground Combat Center Twentynine Palms, California, April 24, 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.