Commandant of the Marine Corps Gen. Robert Neller speaks to an audience at the Modern Day Marine Military Exposition Sept. 28 about the new Marine Corps Operating Concept (MOC), which was released today. The MOC outlines how the Marine Corps will have to be organized, trained, and equipped to fight the enemies of the future. - Commandant of the Marine Corps Gen. Robert Neller speaks to an audience at the Modern Day Marine Military Exposition Sept. 28 about the new Marine Corps Operating Concept (MOC), which was released today. The MOC outlines how the Marine Corps will have to be organized, trained, and equipped to fight the enemies of the future.