Lance Cpl. Alfredo Mercedes, right, a mortarman with Weapons Company, 3rd Battalion, 25th Marine Regiment, 4th Marine Division, looks through the viewfinder of an 81mm mortar system while executing remedial exercises during Integrated Training Exercise 4-19 at Camp Wilson aboard the Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., June 5, 2019. ITX measures their ability to provide a cohesive, trained, and ready capability in support of service and Combatant Commander requirements. (U.S. Marine Corps photo by Lance Cpl. Preston L. Morris)