U.S. Marines with Lima Company, 3rd Battalion, 25th Marine Regiment, 4th Marine Division conduct a combat conditioning hike during Integrated Training Exercise 4-19 at Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., June 7, 2019. ITX is a combined-arms exercise conducted to prepare units for global contingencies and to increase combat readiness. (U.S. Marine Corps photo by Lance Cpl. Preston L. Morris)