Lance Cpl. Alfredo Mercedes, center left, and Lance Cpl. Tim Teague, center right, both mortarmen with Weapons Company, 3rd Battalion, 25th Marine Regiment, 4th Marine Division, are instructed by Cpl. Nick Snyder, right, also a mortarman with Wpns Co., 3/25, 4th MarDiv, while performing remedial drills on an 81mm mortar system during Integrated Training Exercise 4-19 at Camp Wilson aboard the Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., June 5, 2019. ITX 4-19 is a live-fire and maneuver combined arms exercise designed to train battalion and squadron-sized units in tactics, techniques and procedures required to provide a sustainable and ready operational reserve for employment across the full spectrum of crisis and global engagement. (U.S. Marine Corps photo by Lance Cpl. Preston L. Morris)