“U.S. Marine Corps Cpl. Luis A. Chavez, a low altitude air defense (LAAD) gunner with 2nd LAAD Battalion, fires a M16A4 rifle during combat marksmanship training on Camp Lejeune, N.C., Sept. 26, 2017.” U.S. Marine Corps photo by Lance Cpl. Cody J. Ohira, public domain.