5.56mm ammunition rounds are discarded after U.S. Air Force Combat Control trainees, assigned to Operating Location C, 342nd Training Squadron, spend a day shooting their M4 rifles at Pope Army Airfield, N.C., Feb. 11, 2015. CCT and Special Operations Weathers Team trainees spend approximately two years in training before they are assigned to a unit. (U.S. Air Force photo by Airman 1st Class Michael Cossaboom/Released)