Combat instructors at the Infantry Training Battalion pause during a 5-kilometer hike during the first week of the training cycle at Marine Corps Base Camp Geiger, N.C., Sept. 28, 2013. The iteration is the first time female Marines have gone through the infantry course as part of ongoing research into the acceptance of women into combat-related job fields. However, upon graduation the female Marines will not become infantrymen and will proceed to their previously selected job schools. (U.S. Marine Corps photo by Cpl. Chelsea Flowers Anderson/Released)