Mike Garnier, a Fieldcraft instructor assigned to the 423rd Mobility Training Squadron, demonstrates how to change the barrel on an M240 B machine gun during Introduction to Crew Served Weapons to Air Advisor C course students Aug. 12, 2019, at Joint Base McGuire-Dix-Lakehurst, New Jersey. Air Advisor C course students learn how to handle machine guns to better prepare them for their upcoming deployments. (U.S. Air Force photo by Tech. Sgt. Ashley Hyatt)