Afghan air force Sgt. 1st Class Mohammad Saleem and Afghan Sgt. 1st Class Mohammad Haroon prepare their M240 machine gun for their evaluation to become certified crew chief instructors Sept. 10, 2013. Haroon is the first certified Afghan instructor trained by the Afghan air force. (U.S. Army National Guard photo by Sgt. 1st Class Theanne Tangen,129th Mobile Public Affairs Detachment/RELEASED)