Shooters send rounds down range during a sniper training course hosted by the Marksmanship Training Unit aboard the Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., April 25, 2018. The sniper course was held to advance participants’ skills in marksmanship techniques for combat scenarios. (U.S. Marine Corps photo by Lance Cpl. Trevor Terry) - Shooters send rounds down range during a sniper training course hosted by the Marksmanship Training Unit aboard the Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., April 25, 2018. The sniper course was held to advance participants’ skills in marksmanship techniques for combat scenarios. (U.S. Marine Corps photo by Lance Cpl. Trevor Terry)