Cpl. Christopher Stephens, mortarman, 1st Battalion, 1st Marine Regiment, prepares rounds for Pfc. Thomas Curtis, mortarman, 1/1, during an individual training exercise at Range 410A aboard the Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., July 25, 2017. 1/1 is based out of Marine Corps Base Camp Pendleton, Calif. and is serving as part of the GCE during ITX 5-17. (U.S. Marine Corps photo by Pfc. Margaret Gale) - Cpl. Christopher Stephens, mortarman, 1st Battalion, 1st Marine Regiment, prepares rounds for Pfc. Thomas Curtis, mortarman, 1/1, during an individual training exercise at Range 410A aboard the Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., July 25, 2017. 1/1 is based out of Marine Corps Base Camp Pendleton, Calif. and is serving as part of the GCE during ITX 5-17. (U.S. Marine Corps photo by Pfc. Margaret Gale)