U.S. Air Force Tech. Sgt. Joshua Qualle, 673rd Security Forces Squadron combat arms instructor, explains the functions of the M-4 rifle during a Combat Arms Training and Maintenance class April 5, 2012 at Joint Base Elmendorf-Richardson, Alaska. Qualle went over various safety requirements as well as the proper weapon handling techniques. (U.S. Air Force photo/Airman 1st Class Ty-Rico Lea)