Airman 1st Class Jeremy Byrd, 22nd Aircraft Maintenance Squadron aerospace ground equipment journeyman, pulls back a charging handle on an M4 Carbine, Aug. 22, 2017, at McConnell Air Force Base, Kan. During M4 qualification training, Airmen have to complete live-fire qualification with both the iron sight and the close combat optic sight. (U.S. Air Force photo/Staff Sgt. Rachel Waller)
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