U.S. Marine forward observers attached from I Battery, 3rd Battalion, 14th Marine Regiment, 4th Marine Division, call for fire while an exercise controller with Tactical Training Exercise Control Group, Marine Air Ground Task Force Training Command, observes during the mechanized assault course during Integrated Training Exercise 4-19 at Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., June 12, 2019. The ITX force includes each of the Marine Air-Ground Task Force’s subordinate elements who work together in the application of combined-arms maneuver warfare during the exercise. (U.S. Marine Corps photo by Lance Cpl. Preston L. Morris)