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

Iraqi soldiers walk in Jurf al-Sakhr, south of the capital Baghdad, on Monday after Iraqi military forces retook the area from Islamic State militants. Iraqi forces, supported by U.S. airstrikes, have made limited gains in recent months, but critics are questioning whether the U.S. strategy is likely to succeed. Haidar Mohammed Ali/AFP/Getty Images hide caption

itoggle caption Haidar Mohammed Ali/AFP/Getty Images