U.S. Army Soldiers, assigned to Delta Company, 3rd Battalion, 75th Ranger Regiment, conduct Mission Oriented Protective Posture level 4 training 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)