A Marine with Marine Aircraft Group 31 learns how to operate an M2 machine gun during Integrated Training Exercise 1-18 at Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., Nov. 4, 2017. ITX is a large-scale, combined-arms training exercise intended to produce combat-ready forces capable of operating as an integrated Marine Air Ground Task Force. Marine Corps photo by Staff Sgt. Kowshon Ye