A Soldier from the 3rd Infantry Division moves ammunition cases weighing 45 pounds each during the Army Physical Demands Study at Fort Stewart, Ga., March 12, 2014. The Physical Demands Study is part of Soldier 2020, the Army's plan to integrate women into previously closed military occupational specialties in infantry, combat engineer, field artillery and armor military occupational specialties. (U.S. Army photo by Lisa Ferdinando/Released)