Staff Sgt. Nick Niles, 2nd Security Forces Squadron Combat Arms instructor, instructs a class on how to properly hold an M-4 during Rifle/Carbine Air Force Qualification Course at Barksdale Air Force Base, La., Aug. 8. The Air Force recently re-vamped the course of fire and increased the amount of classroom time and rounds fire needed to qualify on the M-16 and M-4 rifles. (U.S. Air Force photo by Senior Airman Sean Martin)