Sgt. Jarrod Simmons speaks to his squad of Marines before they head out on a training march with 55-pound packs on Feb. 22, 2013, at Camp Lejeune, N.C. The Marines and the other military branches must open combat jobs to women in 2016. More than 160 female Marines are taking part in a grueling training program that begins this summer. Scott Olson/Getty Images hide caption

itoggle caption Scott Olson/Getty Images

The Iraqi army left behind equipment, including body armor and vehicles, as Sunni militants overran the northern city of Mosul earlier this month. Safin Hamed/AFP/Getty Images hide caption

itoggle caption Safin Hamed/AFP/Getty Images