Shell casings from an M-4 carbine lay on the ground during the 627th Security Forces Squadron’s Combat Arms Training and Maintenance class at Joint Base Lewis-McChord, Wash., Jan. 31, 2018. Team McChord Airmen undergoing combat arms training fired practice rounds where they could receive coaching from instructors before firing for their qualification. (U.S. Air Force photo by Senior Airman Tryphena Mayhugh)