U.S. Army Soldiers, assigned to Delta Company, 3rd Battalion, 75th Ranger Regiment, engages a target with a Javelin at the National Training Center (NTC), Fort Irwin, Calif., Feb. 23, 2015. NTC is a major training area for the U.S. military to fully exercise their Mission Essential Task List that supports the Army's core competencies. (U.S. Army photo by Spc. Nelson Rodriguez/Released)

U.S. Army Soldiers, assigned to Delta Company, 3rd Battalion, 75th Ranger Regiment, take cover during a live-fire exercise at Fort Irwin, Calif., Feb, 24, 2015. The Rangers specialize in raids and assault missions deep inside enemy territory. (U.S. Army photo by Pfc. William Lockwood/Released)

U.S. Army Soldiers, assigned to Delta Company, 3rd Battalion, 75th Ranger Regiment, assault a town during a live-fire exercise at Fort Irwin, Calif., Feb, 24, 2015. (U.S. Army photo by Pfc. William Lockwood/Released)