Marines with Bravo Company, 1st Battalion, 24th Marine Regiment, 4th Marine Division, practice launching blue-body colored dummy grenades at simulated enemy mortar positions at Camp Grayling, Mich., Aug. 10, 2020. This training is included in the Marine's annual training and readiness manual, which gives guidance on the equipment, ammunition, ranges and support requirements to plan and execute effective training to increase Marines’ lethality. (U.S. Marine Corps photo by Lance Cpl. Leslie Alcaraz)