Staff Sgt. Christopher Keller, 436th Security Forces Squadron combat arms instructor, fires an M4 carbine Dec. 20, 2021, at Dover Air Force Base, Delaware. Keller is one of five instructors at the Dover AFB Combat Arms Training and Maintenance facility. Each instructor is allotted ammunition to practice throughout the year and maintain their skill level. (U.S. Air Force photo by Mauricio Campino)
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