Senior Airman Josh Lien instructs a student firing the M-249 automatic machine gun Aug 31 at Joint Base Charleston-Air Base, during a Combat Arms Training and Maintenance qualifying course. CATM courses consist of small arms training for the M-9 Beretta side arm, M-4 carbine rifle and heavy machine guns, such as the M-240 and M-249 automatic rifles. All Airmen are required to complete qualification courses annually or before deployments. Lien is a combat arms instructor from the 628th Security Forces Squadron, Combat Arms Section. (U.S. Air Force photo/Airman 1st Class Matthew Bruch)

Airmen from the 628th Security Forces Squadron prepare ammunition Aug 31 at Joint Base Charleston-Air Base, during a Combat Arms Training and Maintenance qualifying course. (U.S. Air Force photo/Airman 1st Class Matthew Bruch)

An Airman cleans the firing pin on an M-4 Carbine Sept. 7 at Joint Base Charleston-Air Base, during a Combat Arms Training and Maintenance qualifying course. (U.S. Air Force photo/Airman 1st Class Matthew Bruch)

A Combat Arms instructor from the 628th Security Forces Squadron checks the sights on a student’s M-4 carbine Sept. 7 at Joint Base Charleston-Air Base, during a Combat Arms Training and Maintenance qualifying course. (U.S. Air Force photo/Airman 1st Class Matthew Bruch)

Staff Sgt. Jason Whisenhunt gives advice to students Sept. 7 at Joint Base Charleston-Air Base, during a Combat Arms Training and Maintenance qualifying course. Whisenhunt is a combat arms instructor from the 628th Security Forces Squadron. (U.S. Air Force photo/Airman 1st Class Matthew Bruch)

Airmen clean M-4 carbines Sept. 7 at Joint Base Charleston-Air Base, during a Combat Arms Training and Maintenance qualifying course. (U.S. Air Force photo/Airman 1st Class Matthew Bruch)

Staff Sgt. Robert Macpeek (left), and Staff Sgt. Nicholas Lile have their targets scored Sept. 7 at Joint Base Charleston-Air Base, during a Combat Arms Training and Maintenance qualifying course. Macpeek is assigned to the 628th Logistics Readiness Squadron and Lile is assigned to the 437th Aircraft Maintenance Squadron (U.S. Air Force photo/Airman 1st Class Matthew Bruch)

Combat Arms instructors from the 628th Security Forces Squadron score a student's target Sept. 7 at Joint Base Charleston-Air Base, during a Combat Arms Training and Maintenance qualifying course. (U.S. Air Force photo/Airman 1st Class Matthew Bruch)