Photo essay: CATM class puts bullets on target Published July 20, 2011 By Airman 1st Class Tabatha Duarte 20th Fighter Wing Public Affairs SHAW AIR FORCE BASE, S.C. -- The Combat Arms Training and Maintenance class teaches airmen how to disassemble and reassemble an M4 carbine weapon, the parts, the proper uses, and how to handle the weapon. The people who are required to take the class are those who are deploying, permanent change of station to Korea or completing training.