Airman 1st Class Kyle Macey, 96th Civil Engineer Squadron firefighter, cleans an M-4 Carbine rifle firing pin, April 9, 2015, at Hurlburt Field, Fla. Once a student finishes on the firing range, they must clean every piece of their weapon before returning it to the armory. (U.S. Air Force photo/Airman 1st Class Ryan Conroy)