U.S. Gen. John Campbell (left) and Command Sgt. Maj. Delbert Byers open the Operation Resolute Support flag during a ceremony at the International Security Assistance Force headquarters in Kabul, Afghanistan on Sunday. Massoud Hossaini/AP hide caption

itoggle caption Massoud Hossaini/AP

Katie Gorz (left) performs the ammo can lift next to male Marines as they go through the combat fitness test. The Marine Corps is experimenting with inserting some women into combat infantry roles that have historically been limited to men. At Camp Lejeune, female Marines are undergoing the same training as their male counterparts for combat arms. Travis Dove for NPR hide caption

itoggle caption Travis Dove for NPR